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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Statement of Cash Flows [Abstract]    
Net income (Loss), Including Portion Attributable to Noncontrolling Interest $ 308,266 $ 323,892
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 50,678 43,951
Allowance for doubtful accounts 1,096 (542)
Equity in losses of unconsolidated affiliates 679 584
Stock-based payment compensation 17,239 15,613
Loss (gain) on sale of property and equipment 4,044 (125)
Deferred income taxes (17) 21,791
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (43,361) (35,668)
Vehicle pooling costs (1,590) (3,289)
Inventories (6,700) 1,027
Prepaid expenses and other current assets (371) 1,440
Other assets (413) (1,185)
Accounts payable and accrued liabilities 27,981 1,140
Deferred revenue 849 1,532
Income taxes receivable 5,043 (23,909)
Income taxes payable 14,025 2,619
Other liabilities (251) (1,044)
Net cash provided by operating activities 377,197 347,827
Cash flows from investing activities:    
Purchases of property and equipment (179,695) (124,710)
Proceeds from sale of property and equipment 3,368 554
Purchase of assets in connection with acquisitions (8,787) (10,000)
Investment in unconsolidated affiliate 0 (3,566)
Net cash used in investing activities (185,114) (137,722)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 23,816 30,171
Proceeds from the issuance of Employee Stock Purchase Plan shares 2,723 1,908
Payments for employee stock-based tax withholdings 3 134,638
Net repayments on revolving loan facility (231,000) (73,000)
Payments to Noncontrolling Interests (55) 0
Net cash used in financing activities (204,519) (175,559)
Effect of foreign currency translation 6,611 (774)
Net (decrease) increase in cash and cash equivalents (5,825) 33,772
Cash and cash equivalents at beginning of period 210,100 155,849
Cash and cash equivalents at end of period 204,275 189,621
Supplemental disclosure of cash flow information:    
Interest paid 15,406 17,681
Income taxes paid, net of refunds $ 102,762 $ 9,452