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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Cash flows from operating activities:      
Net Income $ 936,495 $ 699,907 $ 591,693
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization, including debt cost 123,084 104,257 85,334
Provision for Other Credit Losses (1,121) 1,670 (429)
Equity in (earnings) losses of unconsolidated affiliates (3,240) 1,401 419
Stock-based compensation 40,922 23,322 23,445
Gain on sale of property and equipment (1,480) (1,913) (3,073)
Deferred income taxes (7,951) 23,082 23,167
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable (127,513) 15,993 (60,808)
Vehicle pooling costs (20,476) 2,590 (16,418)
Inventories (24,602) 1,348 (4,719)
Prepaid expenses and other current and non-current assets 7,025 141 (12,265)
Operating lease right-of-use assets and lease liabilities 570 (572) 0
Accounts payable and accrued liabilities 44,613 41,648 11,126
Deferred revenue 8,781 1,615 2,056
Income taxes receivable 6,739 (7,216) (4,215)
Income taxes payable 9,045 10,114 10,669
Other liabilities 0 498 664
Net Cash Provided by (Used in) Operating Activities 990,891 917,885 646,646
Cash flows from investing activities:      
Purchases of property and equipment (462,996) (591,972) (373,883)
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (5,000) (11,702) (745)
Proceeds from sale of property and equipment 2,530 2,466 18,361
Net Cash Provided by (Used in) Investing Activities (465,466) (601,208) (356,267)
Cash flows from financing activities:      
Proceeds from the exercise of stock options 39,049 71,640 34,398
Proceeds from the issuance of Employee Stock Purchase Plan shares 9,136 8,276 7,183
Repurchases of common stock 0 0 (364,997)
Payments for employee stock-based tax withholdings (6,145) (103,451) (46,888)
Debt offering costs 0 (2,814) 0
Financing cash flows related to finance leases (1,118) (1,065) 0
Net Cash Provided by (Used in) Financing Activities 40,922 (27,414) (370,304)
Effect of foreign currency translation 4,195 2,136 (8,276)
Net increase (decrease) in cash, cash equivalents, and restricted cash 570,542 291,399 (88,201)
Cash, cash equivalents, and restricted cash at beginning of period 477,718 186,319 274,520
Cash, cash equivalents, and restricted cash at end of period 1,048,260 477,718 186,319
Supplemental disclosure of cash flow information:      
Interest paid 19,723 19,728 19,289
Income taxes paid, net of refunds $ 178,241 $ 83,770 $ 82,448