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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Cash flows from operating activities:    
Net income $ 61,853 $ 106,477
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 64,719 68,393
(Benefit) provision for deferred income taxes (4,414) 1,021
Share-based compensation expense 13,956 12,752
Loss on disposition of property and equipment, net 2,060 1,275
Changes in assets and liabilities:    
Receivables (20,783) (19,569)
Inventory (24,475) (37,432)
Prepaid expenses and other assets 2,758 7,237
Payables, accrued expenses and other liabilities 27,628 20,816
Net cash provided by operating activities 123,302 160,970
Cash flows from investing activities:    
Cash paid for property and equipment (43,004) (74,403)
Cash paid for marketable securities (116,675) (95,536)
Sales and maturities of marketable securities 152,838 109,357
Acquisition of business   (15,325)
Net cash used in investing activities (6,841) (75,907)
Cash flows from financing activities:    
Repayments of long-term debt   (100,000)
Proceeds from the exercise of stock options   2,901
Share repurchases related to share repurchase program (90,511) (10,704)
Share repurchases related to taxes for share-based awards (1,142)  
Net cash used in financing activities (91,653) (107,803)
Effect of exchange rate changes on cash and cash equivalents 3,811 580
Increase (decrease) in cash and cash equivalents 28,619 (22,160)
Cash and cash equivalents at beginning of period 248,140 265,276
Cash and cash equivalents at end of period 276,759 243,116
Cash paid during the year for:    
Income taxes 41,595 41,329
Non-cash investing activities—Accrued capital expenditures $ 9,246 $ 20,525