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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Cash flows from operating activities:      
Net income $ 1,090,130 $ 936,495 $ 699,907
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization, including debt cost 138,605 123,084 104,257
Allowance for credit loss 1,349 (1,121) 1,670
Equity in (earnings) losses of unconsolidated affiliates 284 (3,240) 1,401
Stock-based compensation 38,965 40,922 23,322
Gain on sale of property and equipment (939) (1,480) (1,913)
Loss on extinguishment of debt 16,759 0 0
Deferred income taxes 17,017 (7,951) 23,082
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable (97,750) (127,513) 15,993
Vehicle pooling costs (18,342) (20,476) 2,590
Inventories (10,851) (24,602) 1,348
Prepaid expenses and other current and non-current assets (5,156) 7,025 141
Operating lease right-of-use assets and lease liabilities 715 570 (572)
Accounts payable and accrued liabilities 36,306 44,613 41,648
Deferred revenue (574) 8,781 1,615
Income taxes receivable (29,884) 6,739 (7,216)
Income taxes payable 49 9,045 10,114
Other liabilities 0 0 498
Net cash provided by operating activities 1,176,683 990,891 917,885
Cash flows from investing activities:      
Purchases of property and equipment (337,448) (462,996) (591,972)
Purchases of assets and liabilities in connection with acquisitions (106,604) (5,000) (11,702)
Proceeds from sale of property and equipment 4,333 2,530 2,466
Investment in unconsolidated affiliate (2,591) 0 0
Purchase of held to maturity securities (374,866) 0 0
Proceeds from the sale of held to maturity securities 374,866 0 0
Net cash used in investing activities (442,310) (465,466) (601,208)
Cash flows from financing activities:      
Proceeds from the exercise of stock options 28,108 39,049 71,640
Proceeds from the issuance of Employee Stock Purchase Plan shares 9,625 9,136 8,276
Payments for employee stock-based tax withholdings (1,925) (6,145) (103,451)
Debt offering costs (1,212) 0 (2,814)
Principal payments on long-term debt (416,759) 0 0
Payments of finance lease obligations (530) (1,118) (1,065)
Net cash (used in) provided by financing activities (382,693) 40,922 (27,414)
Effect of foreign currency translation (15,704) 4,195 2,136
Net increase in cash, cash equivalents, and restricted cash 335,976 570,542 291,399
Cash, cash equivalents, and restricted cash at beginning of period 1,048,260 477,718 186,319
Cash, cash equivalents, and restricted cash at end of period 1,384,236 1,048,260 477,718
Supplemental disclosure of cash flow information:      
Interest paid 18,539 19,723 19,728
Income taxes paid, net of refunds $ 263,226 $ 178,241 $ 83,770