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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Cash flows from operating activities:    
Net income $ 123,421 $ 95,249
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 64,568 57,092
Benefit for deferred income taxes (3,324) (9,829)
Excess tax benefit on share-based compensation expense (8,061) (1,295)
Share-based compensation expense 7,425 6,642
Loss (gain) on disposition of property and equipment, net 1,348 (87)
Changes in assets and liabilities:    
Receivables (14,358) (11,653)
Inventories (65,226) (72,762)
Prepaid expenses and other assets 9,424 22,735
Payables, accrued expenses and other liabilities 39,871 2,825
Net cash provided by operating activities 155,088 88,917
Cash flows from investing activities:    
Cash paid for property and equipment (66,766) (93,154)
Cash paid for marketable securities (317,375) (132,638)
Sales and maturities of marketable securities 245,759 122,343
Net cash used in investing activities (138,382) (103,449)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 30,188 2,645
Excess tax benefits from stock option exercises 8,061 1,295
Share repurchases related to taxes for share-based awards (365)  
Net cash provided by financing activities 37,884 3,940
Effect of exchange rate changes on cash and cash equivalents (1,371) 800
Increase (decrease) in cash and cash equivalents 53,219 (9,792)
Cash and cash equivalents at beginning of period 245,327 145,273
Cash and cash equivalents at end of period 298,546 135,481
Cash paid during the year for:    
Income taxes 55,099 56,501
Non-cash investing activities-Accrued capital expenditures $ 10,848 $ 20,290