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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Cash flows from operating activities:    
Net income $ 99,617 $ 104,987
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 70,848 68,903
Benefit for deferred income taxes (8,514) (15,109)
Excess tax benefits from share-based awards (5,791) (968)
Share-based compensation expense 7,672 8,633
Loss on disposition of property and equipment, net 887 673
Changes in assets and liabilities:    
Receivables (7,582) (17,475)
Inventories (25,234) (69,645)
Prepaid expenses and other assets 13,509 (215)
Payables, accrued expenses and other liabilities (6,424) 30,817
Net cash provided by operating activities 138,988 110,601
Cash flows from investing activities:    
Cash paid for property and equipment (69,337) (106,157)
Cash paid for marketable securities (150,798) (258,961)
Sales and maturities of marketable securities 213,930 631,950
Net cash (used in) provided by investing activities (6,205) 266,832
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 2,927
Excess tax benefits from share-based awards 5,791 968
Share repurchases related to share repurchase program (253,618) (478,922)
Share repurchases related to taxes for share-based awards (8,017) (61)
Net cash used in financing activities (94,444) (475,088)
Effect of exchange rate changes on cash and cash equivalents 1,544 870
Increase (decrease) in cash and cash equivalents 39,883 (96,785)
Cash and cash equivalents at beginning of period 154,558 242,058
Cash and cash equivalents at end of period 194,441 145,273
Cash paid during the year for:    
Income taxes 29,969 56,259
Non-cash investing activities-Accrued capital expenditures $ 26,186 $ 38,921