Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Supplemental disclosure of cash flow information:
Cash paid for interest, including capital leases	$ 2,742,000	$ 830,000	$ 277,000
Cash paid for income taxes, excluding impact of refunds	114,406,000	100,973,000	105,961,000
Non-cash activity:
Assets acquired under capital leases	2,925,000	0	0
Accrued property and equipment	8,711,000	9,449,000	3,901,000
Notes payable assumed in acquisition	16,664,000	0	0
Proceeds from Long-term Lines of Credit	846,300,000
Repayments of Long-term Lines of Credit	$ (780,400,000)