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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Cash flows from operating activities:    
Net income $ 260,363 $ 200,285
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 32,049 29,227
Allowance for credit loss 295 (157)
Equity in losses (earnings) of unconsolidated affiliates 168 (1,741)
Stock-based compensation 9,452 8,913
Gain on sale of property and equipment (440) (1,230)
Deferred income taxes 8,319 6,239
Changes in operating assets and liabilities:    
Accounts receivable (82,676) (57,860)
Vehicle pooling costs (21,697) (10,600)
Inventories (3,463) (8,259)
Prepaid expenses and other current and non-current assets 3,071 15,236
Operating lease right-of-use assets and lease liabilities 382 153
Accounts payable and accrued liabilities 62,013 42,880
Deferred revenue (979) 1,251
Income taxes receivable 19,479 25,825
Income taxes payable 26,204 8,371
Net cash provided by operating activities 312,540 258,533
Cash flows from investing activities:    
Purchases of property and equipment (64,696) (147,093)
Proceeds from sale of property and equipment 813 271
Net cash used in investing activities (63,883) (146,822)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 5,572 20,014
Payments for employee stock-based tax withholdings (249) (489)
Payments of finance lease obligations (157) (327)
Net cash provided by financing activities 5,166 19,198
Effect of foreign currency translation (3,710) (2,895)
Net increase in cash, cash equivalents, and restricted cash 250,113 128,014
Cash, cash equivalents, and restricted cash at beginning of period 1,048,260 477,718
Cash, cash equivalents, and restricted cash at end of period 1,298,373 605,732
Supplemental disclosure of cash flow information:    
Interest paid 5,080 4,762
Income taxes paid, net of refunds $ 10,089 $ 6,157