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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Cash flows from operating activities:    
Net income $ 151,611 $ 152,130
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 106,751 103,377
Provision (benefit) for deferred income taxes 448 (24,108)
Excess tax benefits from share-based awards (6,419) (2,014)
Share-based compensation expense 12,141 13,608
Loss on disposition of property and equipment, net 910 915
Changes in assets and liabilities:    
Receivables (6,217) (15,981)
Inventories (82,780) (176,931)
Prepaid expenses and other assets 19,972 (5,509)
Payables, accrued expenses and other liabilities 32,188 84,952
Net cash provided by operating activities 228,605 130,439
Cash flows from investing activities:    
Cash paid for property and equipment (109,128) (175,905)
Cash paid for marketable securities (213,423) (311,937)
Sales and maturities of marketable securities 296,172 720,668
Net cash (used in) provided by investing activities (26,379) 232,826
Cash flows from financing activities:    
Borrowings under long-term debt 191,612  
Repayments of long-term debt (76,612)  
Proceeds from the exercise of stock options 46,400 10,692
Excess tax benefits from share-based awards 6,419 2,014
Share repurchases related to share repurchase program (365,527) (485,805)
Share repurchases related to taxes for share-based awards (10,119) (3,094)
Net cash used in financing activities (207,827) (476,193)
Effect of exchange rate changes on cash and cash equivalents 640 (939)
Decrease in cash and cash equivalents (4,961) (113,867)
Cash and cash equivalents at beginning of period 154,558 242,058
Cash and cash equivalents at end of period 149,597 128,191
Cash paid during the year for:    
Income taxes 60,521 105,174
Non-cash investing activities-Accrued capital expenditures $ 14,596 $ 27,894