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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net income $ 193,678 $ 154,766
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 97,786 87,384
Benefit for deferred income taxes (16,910) (6,564)
Excess tax benefit on share-based compensation expense (9,438) (5,438)
Share-based compensation expense 12,411 10,663
Loss (gain) on disposition of property and equipment, net 1,350 (82)
Changes in assets and liabilities:    
Receivables (15,094) (7,261)
Inventories (123,349) (144,603)
Prepaid expenses and other assets 347 37,144
Payables, accrued expenses and other liabilities 69,846 64,383
Net cash provided by operating activities 210,627 190,392
Cash flows from investing activities:    
Cash paid for property and equipment (128,460) (130,470)
Cash paid for marketable securities (491,404) (198,730)
Sales and maturities of marketable securities 326,103 175,991
Net cash used in investing activities (293,761) (153,209)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 34,200 28,068
Excess tax benefits from stock option exercises 9,438 5,438
Share repurchases related to share repurchase program (10,694)  
Share repurchases related to taxes for share-based awards (385)  
Net cash provided by financing activities 32,559 33,506
Effect of exchange rate changes on cash and cash equivalents 177 686
(Decrease) increase in cash and cash equivalents (50,398) 71,375
Cash and cash equivalents at beginning of period 245,327 145,273
Cash and cash equivalents at end of period 194,929 216,648
Cash paid during the year for:    
Income taxes 110,245 63,365
Non-cash investing activities-Accrued capital expenditures $ 25,968 $ 22,301