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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Cash flows from operating activities:      
Net income $ 108,263 $ 218,120 $ 224,489
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 128,408 135,330 142,722
Provision (benefit) for deferred income taxes 8,329 (4,801) 13,662
Share-based compensation expense 14,517 18,291 15,623
Impairment 11,410 4,341 8,928
Loss on disposition of property and equipment, net 4,037 3,667 1,400
Changes in assets and liabilities:      
Receivables (21,744) 20,934 (13,820)
Inventory (8,644) (9,963) 26,739
Prepaid expenses and other assets 12,967 (10,359) 3,811
Payables, accrued expenses and other liabilities 45,516 39,692 (3,940)
Net cash provided by operating activities 303,059 415,252 419,614
Cash flows from investing activities:      
Cash paid for property and equipment (83,813) (143,714) (134,950)
Cash paid for marketable securities (281,385) (318,742) (265,872)
Sales and maturities of marketable securities 243,818 243,159 374,057
Acquisition of business   (15,325)  
Net cash used in investing activities (121,380) (234,622) (26,765)
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 share-based awards   4,096 46,400
Share repurchases related to share repurchase program (157,044) (45,787) (465,304)
Share repurchases related to taxes for share-based awards (2,182) (2,052) (10,120)
Net cash used in financing activities (159,226) (193,743) (279,024)
Effect of exchange rate changes on cash and cash equivalents 11,627 (4,023) (3,107)
Increase (decrease) in cash and cash equivalents 34,080 (17,136) 110,718
Cash and cash equivalents at beginning of period 248,140 265,276 154,558
Cash and cash equivalents at end of period 282,220 248,140 265,276
Cash paid during the year for:      
Income taxes 83,986 111,958 99,359
Non-cash investing activities—Accrued capital expenditures $ 10,144 $ 17,020 $ 11,607