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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Cash flows from operating activities:    
Net income $ 153,832 $ 151,611
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 101,181 106,751
(Benefit) provision for deferred income taxes (11,087) 448
Excess tax benefits from share-based awards (333) (6,419)
Share-based compensation expense 20,032 12,141
Loss on disposition of property and equipment, net 2,801 910
Changes in assets and liabilities:    
Receivables 6,261 (6,217)
Inventory (126,934) (82,780)
Prepaid expenses and other assets (7,331) 19,972
Payables, accrued expenses and other liabilities 90,592 32,188
Net cash provided by operating activities 229,014 228,605
Cash flows from investing activities:    
Cash paid for property and equipment (112,069) (109,128)
Cash paid for marketable securities (152,340) (213,423)
Sales and maturities of marketable securities 218,400 296,172
Acquisition of business (15,325)  
Net cash used in investing activities (61,334) (26,379)
Cash flows from financing activities:    
Borrowings under long-term debt   191,612
Repayments of long-term debt (150,000) (76,612)
Proceeds from the exercise of stock options 4,096 46,400
Excess tax benefits from share-based awards 333 6,419
Share repurchases related to share repurchase program (45,787) (365,527)
Share repurchases related to taxes for share-based awards (2,049) (10,119)
Net cash used in financing activities (193,407) (207,827)
Effect of exchange rate changes on cash and cash equivalents (4,663) 640
Decrease in cash and cash equivalents (30,390) (4,961)
Cash and cash equivalents at beginning of period 265,276 154,558
Cash and cash equivalents at end of period 234,886 149,597
Cash paid during the period for:    
Income taxes 85,179 60,521
Non-cash investing activities-Accrued capital expenditures $ 16,012 $ 14,596