Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Cash Flow Disclosures (Details) (USD $)	9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Supplemental disclosure of cash flow information:
Cash paid for interest, including capital leases	$ 2,005,000	$ 1,949,000
Cash paid for income taxes, excluding impact of refunds	95,190,000	111,934,000
Non-cash activity:
Assets acquired under capital leases	392,000	2,925,000
Accrued property and equipment	17,004,000	15,275,000
Notes payable assumed in acquisition	0	16,664,000
Proceeds from Long-term Lines of Credit	1,161,100,000
Repayments of Long-term Lines of Credit	$ 763,900,000