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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Cash flows from operating activities:      
Net income $ 282,360 $ 237,314 $ 185,251
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 132,664 118,664 108,112
(Benefit) provision for deferred income taxes (28,505) 22,248 (12,150)
Excess tax benefits from stock option exercises (9,540) (6,713) (8,995)
Share-based compensation expense 15,742 10,892 3,068
Loss on disposition of property and equipment, net 2,368 616 857
Changes in assets and liabilities:      
Receivables (15,368) (2,917) (251)
Inventories (27,713) (32,237) (20,817)
Prepaid expenses and other assets 2,985 16,057 6,317
Payables, accrued expenses and other liabilities 68,162 31,756 21,310
Net cash provided by operating activities 423,155 395,680 282,702
Cash flows from investing activities:      
Cash paid for property and equipment (186,101) (168,875) (190,010)
Cash paid for marketable securities (727,987) (372,689) (169,467)
Sales and maturities of marketable securities 451,866 207,576 414,769
Net cash (used in) provided by investing activities (462,222) (333,988) 55,292
Cash flows from financing activities:      
Proceeds from the exercise of stock options 35,218 30,671 4,136
Excess tax benefits from stock option exercises 9,540 6,713 8,995
Share repurchases related to share repurchase program (10,695)   (538,311)
Share repurchases related to taxes for share-based awards (397)   (7,167)
Net cash provided by (used in) financing activities 33,666 37,384 (532,347)
Effect of exchange rate changes on cash and cash equivalents 2,132 978 (631)
(Decrease) increase in cash and cash equivalents (3,269) 100,054 (194,984)
Cash and cash equivalents at beginning of period 245,327 145,273 340,257
Cash and cash equivalents at end of period 242,058 245,327 145,273
Cash paid during the year for:      
Income taxes 159,628 103,006 120,847
Non-cash investing activities-Accrued capital expenditures $ 20,889 $ 15,055 $ 21,955