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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Cash flows from operating activities:    
Net income $ 233,346 $ 111,614
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 30,146 23,294
Allowance for doubtful accounts 26 1,270
Equity in losses of unconsolidated affiliates 408 483
Stock-based payment compensation 10,605 10,800
Gain on sale of property and equipment (79) (106)
Deferred income taxes 23,466 (106)
Changes in operating assets and liabilities:    
Accounts receivable (74,789) (68,683)
Vehicle pooling costs (5,977) (5,139)
Inventories 1,033 (1,310)
Prepaid expenses and other current assets 894 (216)
Other assets (801) 448
Accounts payable and accrued liabilities (4,599) 3,702
Deferred revenue 1,350 1,810
Income taxes receivable (64,757) (1,648)
Income taxes payable 5,934 7,897
Other liabilities (678) (789)
Net cash provided by operating activities 155,528 83,321
Cash flows from investing activities:    
Purchases of property and equipment (92,412) (77,763)
Proceeds from sale of property and equipment 281 296
Proceeds from sale of assets held for sale 105 100
Investment in unconsolidated affiliate (1,050) 0
Purchases of marketable securities 0 (21,119)
Net cash used in investing activities (93,076) (98,486)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 20,381 944
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,908 1,640
Repurchases of common stock 0 (325,000)
Payments for employee stock-based tax withholdings 134,638 0
Proceeds from the issuance of long-term debt, net of discount 0 68,000
Proceeds from revolving loan facility, net of repayments 72,000 0
Principal payments on long-term debt 0 (37,500)
Net cash used in financing activities (40,349) (291,916)
Effect of foreign currency translation (3,000) (7,515)
Net increase (decrease) in cash and cash equivalents 19,103 (314,596)
Cash and cash equivalents at beginning of period 155,849 456,012
Cash and cash equivalents at end of period 174,952 141,416
Supplemental disclosure of cash flow information:    
Interest paid 11,810 11,294
Income taxes paid, net of refunds $ 4,616 $ 55,413