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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Cash flows from operating activities:    
Net income $ 323,892 $ 186,238
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including debt cost 43,951 35,900
Allowance for doubtful accounts (542) 1,227
Equity in losses of unconsolidated affiliates 584 768
Stock-based payment compensation 15,613 15,834
Gain on sale of property and equipment (125) (188)
Deferred income taxes 21,791 (325)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (35,668) (49,594)
Vehicle pooling costs (3,289) (5,001)
Inventories 1,027 (3,120)
Prepaid expenses and other current assets 1,440 293
Other assets (1,185) 3,206
Accounts payable and accrued liabilities 1,140 5,024
Deferred revenue 1,532 2,038
Income taxes receivable (23,909) 3,326
Income taxes payable 2,619 13,858
Other liabilities (1,044) (1,138)
Net cash provided by operating activities 347,827 208,346
Cash flows from investing activities:    
Purchases of property and equipment (124,710) (143,833)
Proceeds from sale of property and equipment 554 485
Purchase of assets in connection with acquisitions (10,000) 0
Investment in unconsolidated affiliate (3,566) 0
Purchases of marketable securities 0 (21,119)
Proceeds from sale of marketable securities 0 21,498
Net cash used in investing activities (137,722) (142,969)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 30,171 4,989
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,908 1,640
Repurchases of common stock 0 (442,855)
Payments for employee stock-based tax withholdings 134,638 0
Proceeds from the issuance of long-term debt, net of discount 0 93,468
Repayments on revolving loan facility, net of proceeds (73,000) 0
Debt offering costs 0 (165)
Principal payments on long-term debt 0 (37,500)
Net cash used in financing activities (175,559) (380,423)
Effect of foreign currency translation (774) (3,313)
Net increase (decrease) in cash and cash equivalents 33,772 (318,359)
Cash and cash equivalents at beginning of period 155,849 456,012
Cash and cash equivalents at end of period 189,621 137,653
Supplemental disclosure of cash flow information:    
Interest paid 17,681 16,996
Income taxes paid, net of refunds $ 9,452 $ 86,243