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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Cash flows from operating activities:    
Net income $ 154,766 $ 145,996
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 87,384 80,708
Provision for deferred income taxes (6,564) (2,322)
Excess tax benefit on share-based compensation (5,438) (512)
Share-based compensation expense 10,663 8,344
Loss/(gain) on disposition of property and equipment, net (82) 857
Changes in assets and liabilities:    
Receivables (7,261) (10,304)
Inventories (144,603) (137,657)
Prepaid expenses and other assets 37,144 2,151
Payables, accrued expenses and other liabilities 64,383 41,803
Net cash provided by operating activities 190,392 129,064
Cash flows from investing activities:    
Cash paid for property and equipment (130,470) (139,566)
Cash paid for marketable securities (198,730) (97,180)
Sales and maturities of marketable securities 175,991 384,594
Net cash (used in) provided by investing activities (153,209) 147,848
Cash flows from financing activities:    
Proceeds from the exercise of stock options 28,068 3,511
Excess tax benefits from stock option exercises 5,438 512
Share repurchases   (538,311)
Net cash provided by (used in) financing activities 33,506 (534,288)
Effect of exchange rate changes on cash and cash equivalents 686 489
Increase (decrease) in cash and cash equivalents 71,375 (256,887)
Cash and cash equivalents at beginning of period 145,273 340,257
Cash and cash equivalents at end of period 216,648 83,370
Cash paid during the year for:    
Income taxes 63,365 85,062
Non-cash investing activities-Accrued capital expenditures $ 22,301 $ 27,465