v3.10.0.1
Goodwill and Intangible Assets (Purchased Intangible Assets by Major Class) (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Jul. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Total purchased intangible assets, gross carrying amount $ 242.1 $ 187.3
Total purchased intangible assets, net carrying amount 171.8 140.8
Finite-Lived Intangible Assets    
Gross carrying amount 241.3 186.5
Accumulated amortization (70.3) (46.5)
Net carrying amount 171.0 140.0
In-process research and development    
Indefinite-lived Intangible Assets    
In-process research and development 0.8 0.8
Developed technology    
Finite-Lived Intangible Assets    
Gross carrying amount 203.3 154.7
Accumulated amortization (54.5) (38.2)
Net carrying amount 148.8 116.5
Customer relationships    
Finite-Lived Intangible Assets    
Gross carrying amount 17.5 12.2
Accumulated amortization (2.3) (1.2)
Net carrying amount 15.2 11.0
Acquired intellectual property    
Finite-Lived Intangible Assets    
Gross carrying amount 8.9 8.9
Accumulated amortization (4.9) (4.5)
Net carrying amount 4.0 4.4
Trade name and trademarks    
Finite-Lived Intangible Assets    
Gross carrying amount 9.4 8.5
Accumulated amortization (6.4) (0.4)
Net carrying amount 3.0 8.1
Other    
Finite-Lived Intangible Assets    
Gross carrying amount 2.2 2.2
Accumulated amortization (2.2) (2.2)
Net carrying amount $ 0.0 $ 0.0