Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Statement of Cash Flows [Abstract]
Net Income (Loss) Attributable to Parent	$ 200,285	$ 218,180
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including debt cost	29,227	23,704
Allowance for credit loss	(157)	382
Equity in (earnings) losses of unconsolidated affiliates	(1,741)	855
Stock-based compensation	8,913	5,533
Gain on sale of property and equipment	(1,230)	(272)
Deferred income taxes	6,239	4,839
Changes in operating assets and liabilities:
Accounts receivable	(57,860)	(25,408)
Vehicle pooling costs	(10,600)	(9,358)
Inventories	(8,259)	1,710
Prepaid expenses and other current and non-current assets	15,236	4,079
Operating lease right-of-use assets and lease liabilities	(153)	(256)
Accounts payable and accrued liabilities	42,880	16,587
Deferred revenue	1,251	(1,437)
Income taxes receivable	25,825	(28,740)
Income taxes payable	8,371	1,700
Other liabilities	0	(152)
Net Cash Provided by (Used in) Operating Activities	258,533	212,458
Cash flows from investing activities:
Purchases of property and equipment	(147,093)	(131,793)
Proceeds from sale of property and equipment	271	283
Net Cash Provided by (Used in) Investing Activities	(146,822)	(131,510)
Cash flows from financing activities:
Proceeds from the exercise of stock options	20,014	12,620
Payments for employee stock-based tax withholdings	489	101,354
Payments of finance lease obligations	(327)	0
Net Cash Provided by (Used in) Financing Activities	19,198	(88,734)
Effect of foreign currency translation	(2,895)	2,569
Net increase (decrease) in cash, cash equivalents, and restricted cash	128,014	(5,217)
Cash, cash equivalents, and restricted cash at beginning of period	477,718	186,319
Cash, cash equivalents, and restricted cash at end of period	605,732	181,102
Supplemental disclosure of cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities	4,762	4,506
Income taxes paid, net of refunds	$ 6,157	$ 7,465