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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Cash flows from operating activities:      
Net Income $ 591,693 $ 418,007 $ 394,261
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization, including debt cost 85,334 79,040 57,441
Allowance for doubtful accounts (429) 1,142 187
Impairment of long-lived assets 0 1,131 19,365
Equity in losses of unconsolidated affiliates 419 750 671
Stock-based compensation 23,445 23,221 20,840
(Gain) loss on sale of property and equipment (3,073) 3,240 184
Deferred income taxes 23,167 16,717 19,901
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable (60,808) (40,335) (38,542)
Vehicle pooling costs (16,418) (3,353) (1,915)
Inventories (4,719) (3,959) 1,294
Prepaid expenses and other current assets (204) (776) 1,760
Other assets (12,061) 70 1,085
Accounts payable and accrued liabilities 11,126 53,320 4,269
Deferred revenue 2,056 (520) 392
Income taxes receivable (4,215) (8,916) 12,343
Income taxes payable 10,669 (3,149) (333)
Other liabilities 664 (587) (1,145)
Net Cash Provided by (Used in) Operating Activities 646,646 535,069 492,058
Cash flows from investing activities:      
Purchases of property and equipment (373,883) (287,910) (172,178)
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (745) (8,787) (160,812)
Proceeds from sale of property and equipment 18,361 6,425 765
Proceeds from sale of majority-owned subsidiary 0 1,796 0
Investment in unconsolidated affiliate 0 0 (3,566)
Net Cash Provided by (Used in) Investing Activities (356,267) (288,476) (335,791)
Cash flows from financing activities:      
Proceeds from the exercise of stock options 34,398 44,459 31,188
Proceeds from the issuance of Employee Stock Purchase Plan shares 7,183 5,853 4,270
Repurchases of common stock (364,997) 0 0
Payments for employee stock-based tax withholdings (46,888) (1,115) (135,433)
Net repayments on revolving loan facility 0 (231,000) (7,000)
Payments to Noncontrolling Interests 0 (235) 0
Net Cash Provided by (Used in) Financing Activities (370,304) (182,038) (106,975)
Effect of foreign currency translation (8,276) (135) 4,959
Net (decrease) increase in cash and cash equivalents (88,201) 64,420 54,251
Cash and cash equivalents at beginning of period 274,520 210,100 155,849
Cash and cash equivalents at end of period 186,319 274,520 210,100
Supplemental disclosure of cash flow information:      
Interest Paid, Excluding Capitalized Interest, Operating Activities 19,289 20,343 23,221
Income taxes paid, net of refunds $ 82,448 142,161 $ 14,011
International [Member]      
Adjustments to reconcile net income to net cash provided by operating activities:      
Impairment of long-lived assets   $ 1,157