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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Cash flows from operating activities:    
Net income $ 106,477 $ 99,617
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 68,393 70,848
Provision (benefit) for deferred income taxes 1,021 (8,514)
Excess tax benefits from share-based awards (50) (5,791)
Share-based compensation expense 12,752 7,672
Loss on disposition of property and equipment, net 1,275 887
Changes in assets and liabilities:    
Receivables (19,569) (7,582)
Inventory (37,432) (25,234)
Prepaid expenses and other assets 7,237 13,509
Payables, accrued expenses and other liabilities 20,816 (6,424)
Net cash provided by operating activities 160,920 138,988
Cash flows from investing activities:    
Cash paid for property and equipment (74,403) (69,337)
Cash paid for marketable securities (95,536) (150,798)
Sales and maturities of marketable securities 109,357 213,930
Acquisition of business (15,325)  
Net cash used in investing activities (75,907) (6,205)
Cash flows from financing activities:    
Borrowings under long-term debt   191,612
Repayments of long-term debt (100,000) (76,612)
Proceeds from the exercise of stock options 2,901 46,400
Excess tax benefits from share-based awards 50 5,791
Share repurchases related to share repurchase program (10,704) (253,618)
Share repurchases related to taxes for share-based awards   (8,017)
Net cash used in financing activities (107,753) (94,444)
Effect of exchange rate changes on cash and cash equivalents 580 1,544
(Decrease) increase in cash and cash equivalents (22,160) 39,883
Cash and cash equivalents at beginning of period 265,276 154,558
Cash and cash equivalents at end of period 243,116 194,441
Cash paid during the period for:    
Income taxes 41,329 29,969
Non-cash investing activities-Accrued capital expenditures $ 20,525 $ 26,186