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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Cash flows from operating activities:    
Net income $ 211,589 $ 106,945
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 89,319 96,966
Benefit for deferred income taxes (10,168) (4,771)
Share-based compensation expense 17,076 13,831
Loss on disposition of property and equipment, net 2,734 3,276
Changes in assets and liabilities:    
Receivables (14,664) (23,567)
Inventory (104,569) (109,258)
Prepaid expenses and other assets (17,748) 2,815
Payables, accrued expenses and other liabilities 96,614 83,411
Net cash provided by operating activities 270,183 169,648
Cash flows from investing activities:    
Cash paid for property and equipment (89,979) (63,338)
Cash paid for marketable securities (280,153) (174,938)
Sales and maturities of marketable securities 211,174 209,937
Net cash used in investing activities (158,958) (28,339)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 13,618  
Share repurchases related to share repurchase program (57,512) (157,044)
Share repurchases related to taxes for share-based awards (10,187) (2,180)
Net cash used in financing activities (54,081) (159,224)
Effect of exchange rate changes on cash and cash equivalents (10,343) 4,501
Increase (decrease) in cash and cash equivalents 46,801 (13,414)
Cash and cash equivalents at beginning of period 282,220 248,140
Cash and cash equivalents at end of period 329,021 234,726
Cash paid during the year for:    
Income taxes 73,454 61,119
Non-cash investing activities—Accrued capital expenditures $ 13,580 $ 8,560