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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Cash flows from operating activities:    
Net income $ 29,562 $ 32,776
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 34,844 35,043
Benefit for deferred income taxes (3,107) (1,074)
Excess tax benefits from stock option exercises (150) (5,495)
Share-based compensation expense 5,760 4,113
Loss on disposition of property and equipment, net 780 281
Changes in assets and liabilities:    
Receivables 3,812 8,081
Inventory (27,357) (38,995)
Prepaid expenses and other assets 13,240 14,036
Payables, accrued expenses and other liabilities 12,573 (40,899)
Net cash provided by operating activities 69,957 7,867
Cash flows from investing activities:    
Cash paid for property and equipment (31,111) (31,815)
Cash paid for marketable securities (37,328) (55,760)
Sales and maturities of marketable securities 57,219 80,942
Acquisition of business (15,325)  
Net cash used in investing activities (26,545) (6,633)
Cash flows from financing activities:    
Repayments of long-term debt (75,000)  
Proceeds from the exercise of stock options 2,472 40,268
Excess tax benefits from stock option exercises 150 5,495
Share repurchases related to share repurchase program (10,704) (17,306)
Share repurchases related to taxes for share-based awards   (7,976)
Net cash (used in) provided by financing activities (83,082) 20,481
Effect of exchange rate changes on cash and cash equivalents 2,538 658
(Decrease) increase in cash and cash equivalents (37,132) 22,373
Cash and cash equivalents at beginning of period 265,276 154,558
Cash and cash equivalents at end of period 228,144 176,931
Cash paid during the year for:    
Income taxes 10,106 9,531
Non-cash investing activities-Accrued capital expenditures $ 15,507 $ 28,903