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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities:    
Net income $ 33,957 $ 38,624
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 28,113 26,551
Provision for deferred income taxes (6,253) (4,246)
Excess tax benefit on share-based compensation (971) (361)
Share-based compensation expense 2,891 2,579
Loss on disposition of property and equipment, net 8 626
Changes in assets and liabilities:    
Receivables (7,125) (9,915)
Inventories (48,776) (33,802)
Prepaid expenses and other assets 14,396 2,312
Payables, accrued expenses and other liabilities 25,828 (2,328)
Net cash provided by operating activities 42,068 20,040
Cash flows from investing activities:    
Cash paid for property and equipment (52,804) (35,738)
Cash paid for marketable securities (61,652) (51,119)
Sales and maturities of marketable securities 53,829 115,442
Net cash (used in) provided by investing activities (60,627) 28,585
Cash flows from financing activities:    
Exercise of stock options 2,109 2,353
Excess tax benefits from stock option exercises 971 361
Share repurchases   (148,674)
Net cash provided by (used in) financing activities 3,080 (145,960)
Effect of exchange rate changes on cash and cash equivalents 668 1,017
Decrease in cash and cash equivalents (14,811) (96,318)
Cash and cash equivalents at beginning of period 145,273 340,257
Cash and cash equivalents at end of period 130,462 243,939
Cash paid during the year for:    
Income taxes 10,026 46,990
Non-cash investing activities-Accrued capital expenditures $ 18,895 $ 8,281