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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Cash flows from operating activities:      
Net income $ 218,120 $ 224,489 $ 232,428
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 135,330 142,722 138,110
(Benefit) provision for deferred income taxes (4,801) 13,662 (2,221)
Excess tax benefits from share-based awards (350) (6,194) (3,822)
Share-based compensation expense 18,291 15,623 16,736
Impairment 4,341 8,928  
Loss on disposition of property and equipment, net 3,667 1,400 3,189
Changes in assets and liabilities:      
Receivables 20,934 (13,820) (18,393)
Inventory (9,963) 26,739 (68,992)
Prepaid expenses and other assets (10,359) 3,811 (23,257)
Payables, accrued expenses and other liabilities 39,692 (3,940) 48,543
Net cash provided by operating activities 414,902 413,420 322,321
Cash flows from investing activities:      
Cash paid for property and equipment (143,714) (134,950) (229,804)
Cash paid for marketable securities (318,742) (265,872) (405,659)
Sales and maturities of marketable securities 243,159 374,057 830,297
Acquisition of business (15,325)    
Net cash (used in) provided by investing activities (234,622) (26,765) 194,834
Cash flows from financing activities:      
Borrowings under long-term debt   291,612  
Repayments of long-term debt (150,000) (141,612)  
Proceeds from the exercise of stock options 4,096 46,400 10,693
Excess tax benefits from share-based awards 350 6,194 3,822
Share repurchases related to share repurchase program (45,787) (465,304) (611,475)
Share repurchases related to taxes for share-based awards (2,052) (10,120) (3,947)
Net cash used in financing activities (193,393) (272,830) (600,907)
Effect of exchange rate changes on cash and cash equivalents (4,023) (3,107) (3,748)
(Decrease) increase in cash and cash equivalents (17,136) 110,718 (87,500)
Cash and cash equivalents at beginning of period 265,276 154,558 242,058
Cash and cash equivalents at end of period 248,140 265,276 154,558
Cash paid during the year for:      
Income taxes 111,958 99,359 144,892
Non-cash investing activities-Accrued capital expenditures $ 17,020 $ 11,607 $ 18,771