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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Cash flows from operating activities:    
Net income $ 185,392 $ 162,371
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 35,900 37,579
Allowance for doubtful accounts 1,227 (453)
Equity in losses of unconsolidated affiliates 768 0
Stock-based payment compensation 15,834 13,290
Excess tax benefit from stock-based payment compensation (848) (1,279)
Gain on sale of property and equipment (188) (735)
Deferred income taxes (325) 3,641
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (49,594) (21,763)
Vehicle pooling costs (5,001) (625)
Inventories (3,120) (1,249)
Prepaid expenses and other current assets 293 1,480
Other assets 3,206 7,584
Accounts payable and accrued liabilities 5,024 2,042
Deferred revenue 2,038 445
Income taxes receivable 4,172 985
Income taxes payable 13,858 1,313
Other liabilities (1,138) (1,257)
Net cash provided by operating activities 207,498 203,369
Cash flows from investing activities:    
Purchases of property and equipment (143,833) (49,079)
Proceeds from sale of property and equipment 385 870
Proceeds from sale of assets held for sale 100 217
Purchases of marketable securities (21,119)  
Proceeds from sale of marketable securities 21,498  
Net cash used in investing activities (142,969) (47,992)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 4,989 3,372
Excess tax benefit from stock-based payment compensation 848 1,279
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,640 1,495
Repurchases of common stock (442,855) (1,737)
Proceeds from the issuance of long-term debt, net of discount 93,468 698,939
Debt offering costs (165) (955)
Principal payments on long-term debt (37,500) (331,250)
Net cash (used in) provided by financing activities (379,575) 371,143
Effect of foreign currency translation (3,313) (6,446)
Net (decrease) increase in cash and cash equivalents (318,359) 520,074
Cash and cash equivalents at beginning of period 456,012 158,668
Cash and cash equivalents at end of period 137,653 678,742
Supplemental disclosure of cash flow information:    
Interest paid 16,996 9,705
Income taxes paid, net of refunds $ 86,243 $ 81,995