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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Cash flows from operating activities:    
Net income $ 95,317 $ 124,614
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 53,304 49,051
Provision for deferred income taxes (2,197) (2,336)
Excess tax benefit on share-based compensation (498) (10,249)
Share-based compensation expense 4,884 4,527
Loss on disposition of property and equipment, net 657 22
Changes in assets and liabilities:    
Receivables (15,978) (4,112)
Inventories (73,056) (57,182)
Prepaid expenses and other assets 21,109 6,215
Payables, accrued expenses and other liabilities 8,000 13,788
Net cash provided by operating activities 91,542 124,338
Cash flows from investing activities:    
Cash paid for property and equipment (77,547) (64,570)
Cash paid for marketable securities (73,740) (169,646)
Sales and maturities of marketable securities 157,467 247,721
Net cash provided by investing activities 6,180 13,505
Cash flows from financing activities:    
Exercise of stock options 3,466 11,000
Excess tax benefits from stock option exercises 498 10,249
Share repurchases (215,993) (71,988)
Net cash used in financing activities (212,029) (50,739)
Effect of exchange rate changes on cash and cash equivalents 431 (1,174)
(Decrease) increase in cash and cash equivalents (113,876) 85,930
Cash and cash equivalents at beginning of period 340,257 159,024
Cash and cash equivalents at end of period 226,381 244,954
Cash paid during the year for:    
Income taxes 48,200 70,424
Non-cash investing activities-Accrued capital expenditures $ 9,514 $ 14,340