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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Statement of Cash Flows [Abstract]    
Net income (Loss), Including Portion Attributable to Noncontrolling Interest $ 180,861 $ 233,346
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 33,994 30,146
Allowance for doubtful accounts 1,013 26
Equity in losses of unconsolidated affiliates 251 408
Stock-based payment compensation 11,298 10,605
Loss (gain) on sale of property and equipment 4,639 (79)
Deferred income taxes 2,666 23,466
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (86,147) (74,789)
Vehicle pooling costs (6,548) (5,977)
Inventories (2,525) 1,033
Prepaid expenses and other current assets (1,437) 894
Other assets (4,320) (801)
Accounts payable and accrued liabilities 38,919 (4,599)
Deferred revenue 1,705 1,350
Income taxes receivable 2,575 (64,757)
Income taxes payable 9,365 5,934
Other liabilities 84 (678)
Net cash provided by operating activities 186,393 155,528
Cash flows from investing activities:    
Purchases of property and equipment (110,905) (92,412)
Proceeds from sale of property and equipment 2,812 386
Purchase of assets in connection with acquisitions 123 0
Investment in unconsolidated affiliate 0 (1,050)
Net cash used in investing activities (107,970) (93,076)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 16,603 20,381
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) proceeds on revolving loan facility (120,300) 72,000
Payments to Noncontrolling Interests (55) 0
Net cash used in financing activities (101,032) (40,349)
Effect of foreign currency translation 7,809 (3,000)
Net (decrease) increase in cash and cash equivalents (14,800) 19,103
Cash and cash equivalents at beginning of period 210,100 155,849
Cash and cash equivalents at end of period 195,300 174,952
Supplemental disclosure of cash flow information:    
Interest paid 11,010 11,810
Income taxes paid, net of refunds $ 64,104 $ 4,616