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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Cash flows from operating activities:    
Net income $ 11,938 $ 29,562
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 32,136 34,844
Benefit for deferred income taxes (3,872) (3,107)
Share-based compensation expense 6,163 5,760
Loss on disposition of property and equipment, net 528 780
Changes in assets and liabilities:    
Receivables (29,308) 3,812
Inventory (20,365) (27,357)
Prepaid expenses and other assets 2,356 13,240
Payables, accrued expenses and other liabilities 13,454 12,573
Net cash provided by operating activities 13,030 70,107
Cash flows from investing activities:    
Cash paid for property and equipment (23,541) (31,111)
Cash paid for marketable securities (50,272) (37,328)
Sales and maturities of marketable securities 64,903 57,219
Acquisition of business   (15,325)
Net cash used in investing activities (8,910) (26,545)
Cash flows from financing activities:    
Repayments of long-term debt   (75,000)
Proceeds from the exercise of stock options   2,472
Share repurchases related to share repurchase program   (10,704)
Share repurchases related to taxes for share-based awards (1,142)  
Net cash used in financing activities (1,142) (83,232)
Effect of exchange rate changes on cash and cash equivalents 1,366 2,538
Increase (decrease) in cash and cash equivalents 4,344 (37,132)
Cash and cash equivalents at beginning of period 248,140 265,276
Cash and cash equivalents at end of period 252,484 228,144
Cash paid during the year for:    
Income taxes 6,865 10,106
Non-cash investing activities-Accrued capital expenditures $ 7,961 $ 15,507