Current and long-term obligations (Details) (USD $)	3 Months Ended				3 Months Ended					1 Months Ended
	May 04, 2012	Apr. 29, 2011	May 04, 2012 ABL Facility, as amended and restated	Mar. 15, 2012 ABL Facility, as amended and restated	May 04, 2012 ABL Facility, as amended and restated LIBOR loans	May 04, 2012 ABL Facility, as amended and restated Base-rate Loans	Mar. 15, 2012 ABL Facility, as amended and restated Letters of credit	Mar. 30, 2012 Term loan facility	Mar. 30, 2012 Term loan facility Term loan facility, due July 6, 2017	Apr. 29, 2011 Senior notes
Current and long-term obligations
Maximum financing under credit agreements				$ 1,200,000,000			$ 350,000,000
Commitment fees (as a percent)			0.375%
Debt issue cost capitalized				2,600,000					5,200,000
Variable rate basis					LIBOR	Base Rate
Spread on variable rate (as a percent)					1.50%	0.50%
Write off of portion of deferred debt issue cost associated with prepayment			1,600,000
Principal amount of notes repurchased										25,000,000
Redemption price as percentage of principal amount										107.00%
Loss on debt retirement, net	1,629,000	2,167,000								2,200,000
Facility amount								$ 1,964,000,000	$ 879,700,000