Consolidated Statements of Cash Flow - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Cash flows from operating activities:
Net Income	$ 699,907	$ 591,693	$ 418,007
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including debt cost	104,257	85,334	79,040
Allowance for doubtful accounts	1,670	(429)	1,142
Impairment of Intangible Assets, Finite-lived	0	0	1,157
Equity in losses of unconsolidated affiliates	1,401	419	750
Stock-based compensation	23,322	23,445	23,221
(Gain) loss on sale of property and equipment	(1,913)	(3,073)	3,240
Deferred income taxes	23,082	23,167	16,717
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	15,993	(60,808)	(40,335)
Vehicle pooling costs	2,590	(16,418)	(3,353)
Inventories	1,348	(4,719)	(3,959)
Prepaid expenses and other current and non-current assets	141	(12,265)	(706)
Operating lease right-of-use assets and lease liabilities	(572)	0	0
Accounts payable and accrued liabilities	41,648	11,126	53,320
Deferred revenue	1,615	2,056	(520)
Income taxes receivable	(7,216)	(4,215)	(8,916)
Income taxes payable	10,114	10,669	(3,149)
Other liabilities	498	664	(587)
Net Cash Provided by (Used in) Operating Activities	917,885	646,646	535,069
Cash flows from investing activities:
Purchases of property and equipment	(591,972)	(373,883)	(287,910)
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired	(11,702)	(745)	(8,787)
Proceeds from sale of property and equipment	2,466	18,361	6,425
Proceeds from sale of majority-owned subsidiary	0	0	1,796
Net Cash Provided by (Used in) Investing Activities	(601,208)	(356,267)	(288,476)
Cash flows from financing activities:
Proceeds from the exercise of stock options	71,640	34,398	44,459
Proceeds from the issuance of Employee Stock Purchase Plan shares	8,276	7,183	5,853
Repurchases of common stock	0	(364,997)	0
Payments for employee stock-based tax withholdings	(103,451)	(46,888)	(1,115)
Net repayments on revolving loan facility	0	0	(231,000)
Debt offering costs	(2,814)	0	0
Financing cash flows related to finance leases	(1,065)	0	0
Payments to Noncontrolling Interests	0	0	(235)
Net Cash Provided by (Used in) Financing Activities	(27,414)	(370,304)	(182,038)
Effect of foreign currency translation	2,136	(8,276)	(135)
Net increase (decrease) in cash, cash equivalents, and restricted cash	291,399	(88,201)	64,420
Cash, cash equivalents, and restricted cash at beginning of period	186,319	274,520	210,100
Cash, cash equivalents, and restricted cash at end of period	477,718	186,319	274,520
Supplemental disclosure of cash flow information:
Interest paid	19,728	19,289	20,343
Income taxes paid, net of refunds	$ 83,770	$ 82,448	$ 142,161