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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Statement of Cash Flows [Abstract]    
Net income (Loss), Including Portion Attributable to Noncontrolling Interest $ 245,456 $ 180,861
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 42,487 33,994
Allowance for doubtful accounts 96 1,013
Equity in (earnings) losses of unconsolidated affiliates (514) 251
Stock-based compensation 11,950 11,298
(Gain) loss on sale of property and equipment (3,890) 4,639
Deferred income taxes 6,632 2,666
Changes in operating assets and liabilities:    
Accounts receivable (86,125) (86,147)
Vehicle pooling costs (20,218) (6,548)
Inventories (11,640) (2,525)
Prepaid expenses and other current assets (1,220) (1,437)
Other assets 495 (4,320)
Accounts payable and accrued liabilities 7,338 38,919
Deferred revenue 2,843 1,705
Income taxes receivable 15,286 2,575
Income taxes payable 6,890 9,365
Other liabilities (662) 84
Net cash provided by operating activities 215,204 186,393
Cash flows from investing activities:    
Purchases of property and equipment (136,727) (110,905)
Proceeds from sale of property and equipment 17,488 2,812
Purchase of assets in connection with acquisitions 0 123
Net cash used in investing activities (119,239) (107,970)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 5,220 16,603
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 27 3
Net proceeds (repayments) on revolving loan facility 93,300 (120,300)
Payments to Noncontrolling Interests 0 (55)
Net cash used in financing activities (263,003) (101,032)
Effect of foreign currency translation 692 7,809
Net decrease in cash and cash equivalents (166,346) (14,800)
Cash and cash equivalents at beginning of period 274,520 210,100
Cash and cash equivalents at end of period 108,174 195,300
Supplemental disclosure of cash flow information:    
Interest paid 9,018 11,010
Income taxes paid, net of refunds $ 39,327 $ 64,104