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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net income $ 152,130 $ 193,678
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 103,377 97,786
Benefit for deferred income taxes (24,108) (16,910)
Excess tax benefits from share-based awards (2,014) (9,438)
Share-based compensation expense 13,608 12,411
Loss on disposition of property and equipment, net 915 1,350
Changes in assets and liabilities:    
Receivables (15,981) (15,094)
Inventories (176,931) (123,349)
Prepaid expenses and other assets (5,509) 347
Payables, accrued expenses and other liabilities 84,952 69,846
Net cash provided by operating activities 130,439 210,627
Cash flows from investing activities:    
Cash paid for property and equipment (175,905) (128,460)
Cash paid for marketable securities (311,937) (491,404)
Sales and maturities of marketable securities 720,668 326,103
Net cash provided by (used in) investing activities 232,826 (293,761)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 10,692 34,200
Excess tax benefits from share-based awards 2,014 9,438
Share repurchases related to share repurchase program (485,805) (10,694)
Share repurchases related to taxes for share-based awards (3,094) (385)
Net cash (used in) provided by financing activities (476,193) 32,559
Effect of exchange rate changes on cash and cash equivalents (939) 177
Decrease in cash and cash equivalents (113,867) (50,398)
Cash and cash equivalents at beginning of period 242,058 245,327
Cash and cash equivalents at end of period 128,191 194,929
Cash paid during the year for:    
Income taxes 105,174 110,245
Non-cash investing activities-Accrued capital expenditures $ 27,894 $ 25,968