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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Cash flows from operating activities:    
Net income $ 145,996 $ 197,720
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 80,708 74,856
Provision for deferred income taxes (2,322) (12,740)
Excess tax benefit on share-based compensation (512) (11,457)
Share-based compensation expense 8,344 7,426
Loss on disposition of property and equipment, net 857 11
Changes in assets and liabilities:    
Receivables (10,304) (9,286)
Inventories (137,657) (102,611)
Prepaid expenses and other assets 2,151 38,256
Payables, accrued expenses and other liabilities 41,803 58,836
Net cash provided by operating activities 129,064 241,011
Cash flows from investing activities:    
Cash paid for property and equipment (139,566) (106,742)
Cash paid for marketable securities (97,180) (253,571)
Sales and maturities of marketable securities 384,594 396,762
Net cash provided by investing activities 147,848 36,449
Cash flows from financing activities:    
Exercise of stock options 3,511 11,379
Excess tax benefits from stock option exercises 512 11,457
Share repurchases (538,311) (204,723)
Net cash used in financing activities (534,288) (181,887)
Effect of exchange rate changes on cash and cash equivalents 489 (1,051)
(Decrease) increase in cash and cash equivalents (256,887) 94,522
Cash and cash equivalents at beginning of period 340,257 159,024
Cash and cash equivalents at end of period 83,370 253,546
Cash paid during the year for:    
Income taxes 85,062 76,940
Non-cash investing activities-Accrued capital expenditures $ 27,465 $ 16,879