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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Cash flows from operating activities:    
Net income $ 41,260 $ 11,938
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 30,464 32,136
Benefit for deferred income taxes (7,166) (3,872)
Share-based compensation expense 5,524 6,163
Loss on disposition of property and equipment, net 1,985 528
Changes in assets and liabilities:    
Receivables (12,194) (29,308)
Inventory (54,379) (20,365)
Prepaid expenses and other assets 1,599 2,356
Payables, accrued expenses and other liabilities 47,022 13,454
Net cash provided by operating activities 54,115 13,030
Cash flows from investing activities:    
Cash paid for property and equipment (24,634) (23,541)
Cash paid for marketable securities (52,237) (50,272)
Sales and maturities of marketable securities 57,400 64,903
Net cash used in investing activities (19,471) (8,910)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 5,273  
Share repurchases related to taxes for share-based awards (5,047) (1,142)
Net cash provided by (used in) financing activities 226 (1,142)
Effect of exchange rate changes on cash and cash equivalents (3,377) 1,366
Increase in cash and cash equivalents 31,493 4,344
Cash and cash equivalents at beginning of period 282,220 248,140
Cash and cash equivalents at end of period 313,713 252,484
Cash paid during the year for:    
Income taxes 2,414 6,865
Non-cash investing activities—Accrued capital expenditures $ 26,177 $ 7,961