Investment Securities (Details Textual) - USD ($) |
Mar. 02, 2019 |
Mar. 03, 2018 |
---|---|---|
Marketable Securities [Line Items] | ||
Short term held-to-maturity securities | $ 485,800,000 | $ 291,700,000 |
Auction Rate Securities | ||
Marketable Securities [Line Items] | ||
Long term available-for-sale investment securities | 20,300,000 | 20,300,000 |
Valuation adjustments | $ 400,000 | 900,000 |
Trading Investment Securities | ||
Marketable Securities [Line Items] | ||
Trading investment securities | $ 86,300,000 |