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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Cash flows from operating activities:    
Net income $ 37,478 $ 47,058
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 34,477 32,078
(Benefit) provision for deferred income taxes (6,393) 30
Excess tax benefits from stock option exercises (70) (5,197)
Share-based compensation expense 4,576 3,641
Loss on disposition of property and equipment, net 171 1,113
Changes in assets and liabilities:    
Receivables (3,986) (9,349)
Inventories (56,761) (43,231)
Prepaid expenses and other assets (1,162) (11,477)
Payables, accrued expenses and other liabilities 16,155 11,138
Net cash provided by operating activities 24,485 25,804
Cash flows from investing activities:    
Cash paid for property and equipment (38,555) (28,293)
Cash paid for marketable securities (169,707) (146,887)
Sales and maturities of marketable securities 485,375 155,801
Net cash provided by (used in) investing activities 277,113 (19,379)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 798 17,504
Excess tax benefits from stock option exercises 70 5,197
Share repurchases related to share repurchase program (353,315)  
Share repurchases related to taxes for share-based awards (61)  
Net cash (used in) provided by financing activities (352,508) 22,701
Effect of exchange rate changes on cash and cash equivalents 677 (989)
(Decrease) increase in cash and cash equivalents (50,233) 28,137
Cash and cash equivalents at beginning of period 242,058 245,327
Cash and cash equivalents at end of period 191,825 273,464
Cash paid during the year for:    
Income taxes 14,080 34,785
Non-cash investing activities-Accrued capital expenditures $ 41,542 $ 8,080