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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Statement of Cash Flows [Abstract]    
Net income (Loss), Including Portion Attributable to Noncontrolling Interest $ 438,197 $ 308,266
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 63,709 50,678
Allowance for doubtful accounts 341 1,096
Equity in (earnings) losses of unconsolidated affiliates (1,852) 679
Stock-based compensation 17,600 17,239
(Gain) loss on sale of property and equipment (3,753) 4,044
Deferred income taxes 14,583 (17)
Changes in operating assets and liabilities:    
Accounts receivable (69,920) (43,361)
Vehicle pooling costs (15,026) (1,590)
Inventories (5,721) (6,700)
Prepaid expenses and other current assets (1,436) (371)
Other assets (7,169) (413)
Accounts payable and accrued liabilities 17,747 27,981
Deferred revenue 3,512 849
Income taxes receivable (3,578) 5,043
Income taxes payable 7,304 14,025
Other liabilities (1,042) (251)
Net cash provided by operating activities 453,496 377,197
Cash flows from investing activities:    
Purchases of property and equipment (259,336) (179,695)
Proceeds from sale of property and equipment 17,928 3,368
Purchase of assets in connection with acquisitions (745) (8,787)
Net cash used in investing activities (242,153) (185,114)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 17,261 23,816
Proceeds from the issuance of Employee Stock Purchase Plan shares 3,501 2,723
Repurchases of common stock (364,997) 0
Payments for employee stock-based tax withholdings 45,594 3
Net proceeds (repayments) on revolving loan facility 7,000 (231,000)
Payments to Noncontrolling Interests 0 (55)
Net cash used in financing activities (382,829) (204,519)
Effect of foreign currency translation (208) 6,611
Net decrease in cash and cash equivalents (171,694) (5,825)
Cash and cash equivalents at beginning of period 274,520 210,100
Cash and cash equivalents at end of period 102,826  
Supplemental disclosure of cash flow information:    
Interest paid 14,700 15,406
Income taxes paid, net of refunds $ 60,926 $ 102,762