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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Cash flows from operating activities:    
Net income $ 106,945 $ 153,832
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 96,966 101,181
Benefit for deferred income taxes (4,771) (11,087)
Share-based compensation expense 13,831 20,032
Loss on disposition of property and equipment, net 3,276 2,801
Changes in assets and liabilities:    
Receivables (23,567) 6,261
Inventory (109,258) (126,934)
Prepaid expenses and other assets 2,815 (7,331)
Payables, accrued expenses and other liabilities 83,411 90,592
Net cash provided by operating activities 169,648 229,347
Cash flows from investing activities:    
Cash paid for property and equipment (63,338) (112,069)
Cash paid for marketable securities (174,938) (152,340)
Sales and maturities of marketable securities 209,937 218,400
Acquisition of business   (15,325)
Net cash used in investing activities (28,339) (61,334)
Cash flows from financing activities:    
Repayments of long-term debt   (150,000)
Proceeds from the exercise of stock options   4,096
Share repurchases related to share repurchase program (157,044) (45,787)
Share repurchases related to taxes for share-based awards (2,180) (2,049)
Net cash used in financing activities (159,224) (193,740)
Effect of exchange rate changes on cash and cash equivalents 4,501 (4,663)
Decrease in cash and cash equivalents (13,414) (30,390)
Cash and cash equivalents at beginning of period 248,140 265,276
Cash and cash equivalents at end of period 234,726 234,886
Cash paid during the year for:    
Income taxes 61,119 85,179
Non-cash investing activities—Accrued capital expenditures $ 8,560 $ 16,012