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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Cash flows from operating activities:    
Net income $ 138,721 $ 137,223
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 42,248 36,316
Allowance for doubtful accounts 234 (254)
Impairment of long-lived assets   8,771
Stock-based compensation 14,671 16,342
Excess benefits from stock-based compensation (6,164) (2,696)
Gain on sale of property and equipment (922) (1,298)
Deferred incomes taxes (3,372) (11,705)
Changes in operating assets and liabilities:    
Accounts receivable (24,769) (6,402)
Vehicle pooling costs (2,197) 1,290
Inventories (2,107) 450
Prepaid expenses and other current assets (2,877) 7,434
Other assets (6,145) 576
Accounts payable and accrued liabilities 22,321 815
Deferred revenue 15 733
Income taxes receivable 4,213 3,825
Income taxes payable 8,695 5,858
Other liabilities 438 (327)
Net cash provided by operating activities 183,003 196,951
Cash flows from investing activities:    
Purchases of property and equipment (114,265) (28,526)
Proceeds from sale of property and equipment 2,281 1,572
Proceeds from sale of assets held for sale 3,189  
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (31,243) (180)
Net cash used in investing activities (140,038) (27,134)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 19,579 9,327
Excess tax benefit from stock-based payment compensation 6,164 2,696
Proceeds from the issuance of Employee Stock Purchase Plan shares 951 1,019
Repurchases of common stock (14,512) (137,655)
Proceeds from the issuance of long-term debt   125,000
Debt offering costs   (313)
Principal payments on long-term debt (56,255) (37,500)
Net cash used in financing activities (44,073) (37,426)
Effect of foreign currency translation 327 734
Net (decrease) increase in cash and cash equivalents (781) 133,125
Cash and cash equivalents at beginning of period 140,112 74,009
Cash and cash equivalents at end of period 139,331 207,134
Supplemental disclosure of cash flow information:    
Interest paid 7,758 8,227
Income taxes paid $ 68,179 $ 75,800