Debt - Additional Information (Detail) (USD $)					6 Months Ended		9 Months Ended
	Nov. 23, 2012	Sep. 21, 2012	Feb. 29, 2012	Nov. 25, 2011	Nov. 23, 2012 Credit Agreement [Member]	Nov. 23, 2012 Accounts Receivable Facility [Member]	Sep. 30, 2012 Amended And Restated Receivables Purchase Agreement [Member]	Sep. 21, 2012 Amended And Restated Receivables Purchase Agreement [Member]	Nov. 23, 2012 Publicly Traded [Member]	Feb. 29, 2012 Publicly Traded [Member]	Nov. 25, 2011 Publicly Traded [Member]	Nov. 23, 2012 Non Publicly Traded [Member]
Debt Instrument [Line Items]
Line of credit facility potential maximum borrowing capacity					$ 400,000,000
Balances outstanding under the revolving credit facility					131,700,000
Available financing of receivables purchase agreement		70,000,000				50,000,000		50,000,000
Letters of credit outstanding	30,600,000
Interest at a rate					1.50%
Liquidity commitments under the receivables purchase agreement renewed day							1 year
Debt due within one year			0	0
Long-term debt net of unamortized discounts	0		0	20,200,000
Fair value of the traded debt									241,900,000	239,600,000	243,600,000	131,700,000
Quoted market prices of Corporation's publicly traded debt, carrying value	$ 356,832,000		$ 225,181,000	$ 234,642,000					$ 225,200,000	$ 225,200,000	$ 234,600,000	$ 131,700,000