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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Cash flows from operating activities:    
Net income $ 92,905 $ 134,069
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 55,395 60,158
Right-of-use asset amortization 94,173  
Provision (benefit) for deferred income taxes 1,107 (9,506)
Share-based compensation expense 11,461 10,990
Loss on disposition of property and equipment, net 593 2,452
Changes in assets and liabilities:    
Receivables (15,032) (14,196)
Inventory (71,899) (26,807)
Prepaid expenses and other assets (23,121) (10,086)
Payables, accrued expenses and other liabilities 16,009 71,728
Operating lease liabilities (100,338)  
Net cash provided by operating activities 61,253 218,802
Cash flows from investing activities:    
Cash paid for property and equipment (116,465) (55,642)
Cash paid for marketable securities (235,094) (168,823)
Sales and maturities of marketable securities 320,411 130,029
Net cash used in investing activities (31,148) (94,436)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 974 13,020
Share repurchases related to share repurchase program (217,421)  
Share repurchases related to taxes for share-based awards (5,429) (5,924)
Net cash (used in) provided by financing activities (221,876) 7,096
Effect of exchange rate changes on cash and cash equivalents (4,471) (7,955)
(Decrease) increase in cash and cash equivalents (196,242) 123,507
Cash and cash equivalents at beginning of period 358,260 282,220
Cash and cash equivalents at end of period 162,018 405,727
Cash paid during the year for:    
Income taxes 37,839 39,698
Non-cash investing activities—Accrued capital expenditures $ 22,325 $ 15,002