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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Statement of Cash Flows [Abstract]    
Net income (Loss), Including Portion Attributable to Noncontrolling Interest $ 114,083 $ 77,560
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 21,978 16,012
Allowance for doubtful accounts 128 547
Equity in losses of unconsolidated affiliates (184) (109)
Stock-based compensation 6,021 5,306
(Gain) loss on sale of property and equipment (102) 4,460
Deferred income taxes (888) 2,759
Changes in operating assets and liabilities:    
Accounts receivable (29,270) (55,904)
Vehicle pooling costs (10,313) (6,568)
Inventories (3,268) 36
Prepaid expenses and other current assets (73) (62)
Other assets 687 (2,420)
Accounts payable and accrued liabilities (20,611) 22,213
Deferred revenue 467 166
Income taxes receivable 15,286 6,272
Income taxes payable 14,177 23,460
Other liabilities (435) (368)
Net cash provided by operating activities 107,683 93,360
Cash flows from investing activities:    
Purchases of property and equipment (62,336) (41,484)
Proceeds from sale of property and equipment 810 2,019
Purchase of assets in connection with acquisitions 0 123
Net cash used in investing activities (61,526) (39,342)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 1,229 9,253
Payments for employee stock-based tax withholdings 2 3
Net repayments on revolving loan facility 0 (49,000)
Net cash provided by (used in) financing activities 1,227 (39,750)
Effect of foreign currency translation (1,595) (122)
Net increase in cash and cash equivalents 45,789 14,146
Cash and cash equivalents at beginning of period 274,520 210,100
Cash and cash equivalents at end of period 320,309 224,246
Supplemental disclosure of cash flow information:    
Interest paid 4,525 5,496
Income taxes paid, net of refunds $ 6,053 $ 4,167