Fair Value Reconciliation of Changes in Level 3 Balances (Details) - Fair Value, Inputs, Level 3 [Member] - Auction Rate Securities [Member] - Fair Value, Measurements, Recurring [Member] $ in Millions	6 Months Ended
	Aug. 26, 2016 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at the beginning of the period	$ 4.4
Unrealized loss on investments	0.2
Balance at the end of period	$ 4.2