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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities:    
Net income $ 95,249 $ 95,317
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 57,092 53,304
Provision for deferred income taxes (9,829) (2,197)
Excess tax benefit on share-based compensation (1,295) (498)
Share-based compensation expense 6,642 4,884
(Gain) loss on disposition of property and equipment, net (87) 657
Changes in assets and liabilities:    
Receivables (11,653) (15,978)
Inventories (72,762) (73,056)
Prepaid expenses and other assets 22,735 21,109
Payables, accrued expenses and other liabilities 2,825 8,000
Net cash provided by operating activities 88,917 91,542
Cash flows from investing activities:    
Cash paid for property and equipment (93,154) (77,547)
Cash paid for marketable securities (132,638) (73,740)
Sales and maturities of marketable securities 122,343 157,467
Net cash (used in) provided by investing activities (103,449) 6,180
Cash flows from financing activities:    
Proceeds from the exercise of stock options 2,645 3,466
Excess tax benefits from stock option exercises 1,295 498
Share repurchases   (215,993)
Net cash provided by (used in) financing activities 3,940 (212,029)
Effect of exchange rate changes on cash and cash equivalents 800 431
Decrease in cash and cash equivalents (9,792) (113,876)
Cash and cash equivalents at beginning of period 145,273 340,257
Cash and cash equivalents at end of period 135,481 226,381
Cash paid during the year for:    
Income taxes 56,501 48,200
Non-cash investing activities-Accrued capital expenditures $ 20,290 $ 9,514