Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	May. 30, 2015	Feb. 28, 2015	May. 31, 2014
Income Taxes
Income tax expense	$ 12,441		$ 11,881
Estimated effective tax rate (as a percent)	39.80%
Valuation allowance released		$ 1,841,304
Valuation allowance against net deferred tax assets	$ 231,683	$ 231,679