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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Cash flows from operating activities:    
Net income $ 111,376 $ 104,808
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 23,294 25,367
Allowance for doubtful accounts 1,270 (242)
Equity in losses of unconsolidated affiliates 483 0
Stock-based payment compensation 10,800 8,870
Excess tax benefit from stock-based payment compensation (241) (534)
Gain on sale of property and equipment (106) (457)
Deferred income taxes (106) (2,317)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (68,683) (40,908)
Vehicle pooling costs (5,139) (2,125)
Inventories (1,310) (1,226)
Prepaid expenses and other current assets (216) 1,747
Other assets 448 5,368
Accounts payable and accrued liabilities 3,702 (4,173)
Deferred revenue 1,810 351
Income taxes receivable (1,410) (4,938)
Income taxes payable 7,897 103
Other liabilities (789) (811)
Net cash provided by operating activities 83,080 88,883
Cash flows from investing activities:    
Purchases of property and equipment (77,763) (39,459)
Proceeds from sale of property and equipment 296 525
Proceeds from sale of assets held for sale 100 217
Purchases of marketable securities (21,119)  
Net cash used in investing activities (98,486) (38,717)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 944 2,303
Excess tax benefit from stock-based payment compensation 241 534
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,640 1,495
Repurchases of common stock (325,000) (1,121)
Proceeds from the issuance of long-term debt, net of discount 0 698,939
Proceeds from revolving loan facility, net of repayments 68,000 0
Debt offering costs 0 (955)
Principal payments on long-term debt (37,500) (312,500)
Net cash (used in) provided by financing activities (291,675) 388,695
Effect of foreign currency translation (7,515) (7,163)
Net (decrease) increase in cash and cash equivalents (314,596) 431,698
Cash and cash equivalents at beginning of period 456,012 158,668
Cash and cash equivalents at end of period 141,416 590,366
Supplemental disclosure of cash flow information:    
Interest paid 11,294 3,788
Income taxes paid, net of refunds $ 55,413 $ 64,432