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Investment Securities (Details Textual) - USD ($)
$ in Millions
Sep. 01, 2018
Mar. 03, 2018
Debt Securities, Available-for-sale [Line Items]    
Short term held-to-maturity securities $ 115.4 $ 291.7
Auction Rate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Long term available-for-sale investment securities 20.3 20.3
Valuation adjustments 0.6 0.9
Other Trading Investment Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Trading investment securities $ 90.5 $ 86.3