Other Credit Arrangements - Additional Information (Detail)			6 Months Ended					6 Months Ended
	Jul. 30, 2011 Currency, U.S. Dollar USD ($)	Jul. 30, 2011 Currency, U.S. Dollar Demand letter of credit facilities USD ($)	Jul. 30, 2011 Currency, U.S. Dollar Demand letter of credit facilities Group 1	Jul. 30, 2011 Currency, U.S. Dollar Demand letter of credit facilities Group 2	Jul. 30, 2011 Currency, U.S. Dollar Demand line borrowings USD ($)	Jul. 30, 2011 Currency, U.S. Dollar Letters of credit or demand line borrowings USD ($)	Jul. 30, 2011 Currency, Canadian Dollar CAD	Jul. 30, 2011 Currency, Canadian Dollar Demand line borrowings CAD
Debt Disclosure [Line Items]
Borrowing agreements with financial institutions	$ 295,000,000	$ 185,000,000			$ 50,000,000	$ 60,000,000	25,000,000	25,000,000
Credit facility expiration date			November 1, 2011	May 31, 2012	April 19, 2012	May 22, 2012		December 13, 2011
Outstanding borrowings		$ 56,000,000			$ 0