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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Cash flows from operating activities:    
Net income $ 47,058 $ 33,957
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 32,078 28,113
Provision (benefit) for deferred income taxes 30 (6,253)
Excess tax benefit on share-based compensation (5,197) (971)
Share-based compensation expense 3,641 2,891
Loss on disposition of property and equipment, net 1,113 8
Changes in assets and liabilities:    
Receivables (9,349) (7,125)
Inventories (43,231) (48,776)
Prepaid expenses and other assets (11,477) 14,396
Accounts payable, accrued expenses and other liabilities 11,138 25,828
Net cash provided by operating activities 25,804 42,068
Cash flows from investing activities:    
Cash paid for property and equipment (28,293) (52,804)
Cash paid for marketable securities (146,887) (61,652)
Sales and maturities of marketable securities 155,801 53,829
Net cash used in investing activities (19,379) (60,627)
Cash flows from financing activities:    
Exercise of stock options 17,504 2,109
Excess tax benefit from share-based awards 5,197 971
Net cash provided by financing activities 22,701 3,080
Effect of exchange rate changes on cash and cash equivalents (989) 668
Increase (decrease) in cash and cash equivalents 28,137 (14,811)
Cash and cash equivalents at beginning of period 245,327 145,273
Cash and cash equivalents at end of period 273,464 130,462
Cash paid during the year for:    
Income taxes 34,785 10,026
Non-cash investing activities-Accrued capital expenditures $ 8,080 $ 18,895