Note 7 - Shareholders' Equity (Details Textual) - USD ($) shares in Millions	6 Months Ended		129 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 29, 2015	Sep. 30, 2015	Jul. 31, 2014
The 2015 Share Repurchase Program [Member] | Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount				$ 2,500,000,000
Stock Repurchase Program, Authorized Amount					$ 9,450,000,000
Treasury Stock, Shares, Acquired	8.2		170.7
Payments for Repurchase of Common Stock	$ 579,296,000	$ 1,303,260,000	$ 9,100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 304,700,000		$ 304,700,000