v3.10.0.1
Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Aug. 31, 2018
Feb. 28, 2018
Aug. 31, 2017
Feb. 28, 2017
Changes in Stockholders' Equity                
Beginning Balance $ 1,289,804 $ 1,407,546 $ 1,478,124 [1] $ 1,252,166        
Net income 94,450 101,609 [2],[3],[4],[5] 294,494 274,011 [2],[3],[4],[5]        
Other comprehensive income (loss), net of tax 4,499 (2,719) [5] (14,541) 52,457 [5]        
Vest and exercise of share-based awards 767 711 1,831 4,541        
Common stock repurchase (12,791) (100,000) (412,845) (237,002)        
Share-based compensation expense 56,278 52,318 154,969 142,983        
Minimum tax withholdings paid by the Company on behalf of employees related to net settlement of employee share-based awards (32,873) (37,807) (127,605) (86,230)        
Re-issuance of treasury stock under employee stock purchase plan 23,619 18,984 55,830 42,732        
Convertible note conversions (123)   (7,034)          
Exercises of convertible note hedges     16          
Exercise of convertible note hedges 1              
Other adjustments   0   (5,016)        
Ending Balance 1,423,631 1,440,642 1,423,631 1,440,642        
Cumulative Effect of New Accounting Principle in Period of Adoption 392   392          
Common Stock                
Changes in Stockholders' Equity                
Beginning Balance $ 24 $ 24 $ 24 $ 24        
Vest and exercise of share-based awards (shares) 791 640 1,931 1,813        
Vest and exercise of share-based awards       $ 0        
Convertible note conversions (shares) 30   1,990          
Shares, Issued 242,610 238,618 242,610 238,618 241,789 238,689 237,978 236,805
Ending Balance $ 24 $ 24 $ 24 $ 24        
Additional Paid-In Capital                
Changes in Stockholders' Equity                
Beginning Balance 2,576,560 2,335,518 2,416,080 2,294,462        
Vest and exercise of share-based awards 767 711 1,831 4,541        
Common stock repurchase 0   0          
Share-based compensation expense 56,278 52,318 154,969 142,983        
Minimum tax withholdings paid by the Company on behalf of employees related to net settlement of employee share-based awards (32,873) (37,807) (127,605) (86,230) [4]        
Re-issuance of treasury stock under employee stock purchase plan 14,158   32,629          
Convertible note conversions (123)   (7,034)          
Exercises of convertible note hedges 1   143,898          
Other adjustments   0   (5,016)        
Ending Balance 2,614,768 2,350,740 2,614,768 2,350,740        
Retained Earnings                
Changes in Stockholders' Equity                
Beginning Balance 1,820,124 1,530,239 1,619,688 [6] 1,357,837 [6]        
Net income 94,450 101,609 294,494 [6] 274,011 [6]        
Convertible note conversions     0          
Ending Balance [6] 1,914,574 1,631,848 1,914,574 1,631,848        
Cumulative Effect of New Accounting Principle in Period of Adoption [6] 392   392          
Treasury Stock                
Changes in Stockholders' Equity                
Beginning Balance (3,055,268) (2,425,059) (2,525,072) (2,311,805)        
Common stock repurchase (12,791) (100,000) (412,845) (237,002)        
Re-issuance of treasury stock under employee stock purchase plan 9,461 18,984 23,201 42,732        
Convertible note conversions 0   0          
Exercises of convertible note hedges 0   (143,882)          
Ending Balance (3,058,598) (2,506,075) (3,058,598) (2,506,075)        
Accumulated Other Comprehensive Loss                
Changes in Stockholders' Equity                
Beginning Balance (51,636) (33,176) (32,596) (88,352)        
Other comprehensive income (loss), net of tax 4,499 (2,719) (14,541) 52,457        
Exercises of convertible note hedges     0          
Ending Balance $ (47,137) $ (35,895) $ (47,137) $ (35,895)        
[1] Derived from audited financial statements except for line items adjusted by the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606.
[2] As adjusted to reflect the impact of the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606.
[3] As adjusted to reflect the impact of the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606.
[4] As adjusted to reflect the impact of the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606.
[5] As adjusted to reflect the impact of the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606.
[6] As adjusted to reflect the impact of the retrospective application of ASC 606. See NOTE 2—Summary of Significant Accounting Policies for detailed information on adoption of ASC 606