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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Cash flows from operating activities:    
Net income $ 134,069 $ 61,853
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 60,158 64,719
Benefit for deferred income taxes (9,506) (4,414)
Share-based compensation expense 10,990 13,956
Loss on disposition of property and equipment, net 2,452 2,060
Changes in assets and liabilities:    
Receivables (14,196) (20,783)
Inventory (26,807) (24,475)
Prepaid expenses and other assets (10,086) 2,758
Payables, accrued expenses and other liabilities 71,728 27,628
Net cash provided by operating activities 218,802 123,302
Cash flows from investing activities:    
Cash paid for property and equipment (55,642) (43,004)
Cash paid for marketable securities (168,823) (116,675)
Sales and maturities of marketable securities 130,029 152,838
Net cash used in investing activities (94,436) (6,841)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 13,020  
Share repurchases related to share repurchase program   (90,511)
Share repurchases related to taxes for share-based awards (5,924) (1,142)
Net cash provided by (used in) financing activities 7,096 (91,653)
Effect of exchange rate changes on cash and cash equivalents (7,955) 3,811
Increase in cash and cash equivalents 123,507 28,619
Cash and cash equivalents at beginning of period 282,220 248,140
Cash and cash equivalents at end of period 405,727 276,759
Cash paid during the year for:    
Income taxes 39,698 41,595
Non-cash investing activities—Accrued capital expenditures $ 15,002 $ 9,246