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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