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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Cash flows from operating activities:      
Net income $ 237,314 $ 185,251 $ 272,958
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 118,664 108,112 101,105
Provision (benefit) for deferred income taxes 22,248 (12,150) (8,727)
Excess tax benefit on share-based compensation (6,713) (8,995) (12,847)
Share-based compensation expense 10,892 3,068 10,725
Loss on disposition of property and equipment, net 616 857 119
Changes in assets and liabilities:      
Receivables (2,917) (251) 1,835
Inventories (32,237) (20,817) (43,372)
Prepaid expenses and other assets 16,057 6,317 14,825
Accounts payable, accrued expenses and other liabilities 31,756 21,310 48,492
Net cash provided by operating activities 395,680 282,702 385,113
Cash flows from investing activities:      
Cash paid for property and equipment (168,875) (190,010) (143,642)
Cash paid for marketable securities (372,689) (169,467) (463,129)
Sales and maturities of marketable securities 207,576 414,769 571,236
Net cash (used in) provided by investing activities (333,988) 55,292 (35,535)
Cash flows from financing activities:      
Exercise of stock options 30,671 4,136 24,129
Excess tax benefit from share-based awards 6,713 8,995 12,847
Share repurchases   (545,478) (204,718)
Net cash provided by (used in) financing activities 37,384 (532,347) (167,742)
Effect of exchange rate changes on cash and cash equivalents 978 (631) (603)
Increase (decrease) in cash and cash equivalents 100,054 (194,984) 181,233
Cash and cash equivalents at beginning of period 145,273 340,257 159,024
Cash and cash equivalents at end of period 245,327 145,273 340,257
Cash paid during the year for:      
Income taxes 103,006 120,847 121,341
Non-cash investing activities-Accrued capital expenditures $ 15,055 $ 21,955 $ 8,077