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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Cash flows from operating activities:    
Net income $ 104,987 $ 123,421
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 68,903 64,568
Benefit for deferred income taxes (15,109) (3,324)
Excess tax benefits from share-based awards (968) (8,061)
Share-based compensation expense 8,633 7,425
Loss on disposition of property and equipment, net 673 1,348
Changes in assets and liabilities:    
Receivables (17,475) (14,358)
Inventories (69,645) (65,226)
Prepaid expenses and other assets (215) 9,424
Payables, accrued expenses and other liabilities 30,817 39,871
Net cash provided by operating activities 110,601 155,088
Cash flows from investing activities:    
Cash paid for property and equipment (106,157) (66,766)
Cash paid for marketable securities (258,961) (317,375)
Sales and maturities of marketable securities 631,950 245,759
Net cash provided by (used in) investing activities 266,832 (138,382)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 2,927 30,188
Excess tax benefits from share-based awards 968 8,061
Share repurchases related to share repurchase program (478,922)  
Share repurchases related to taxes for share-based awards (61) (365)
Net cash (used in) provided by financing activities (475,088) 37,884
Effect of exchange rate changes on cash and cash equivalents 870 (1,371)
(Decrease) increase in cash and cash equivalents (96,785) 53,219
Cash and cash equivalents at beginning of period 242,058 245,327
Cash and cash equivalents at end of period 145,273 298,546
Cash paid during the year for:    
Income taxes 56,259 55,099
Non-cash investing activities-Accrued capital expenditures $ 38,921 $ 10,848