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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities:    
Net income $ 137,223 $ 125,854
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 36,316 34,363
Allowance for doubtful accounts (254) (10)
Impairment of long-lived assets 8,771  
Stock-based compensation 16,342 14,193
Excess tax benefits from stock-based compensation (2,696) (2,925)
(Gain)/loss on sale of property and equipment (1,298) 2,076
Deferred incomes taxes (11,705) (3,155)
Changes in operating assets and liabilities:    
Accounts receivable (6,402) (7,086)
Vehicle pooling costs 1,290 13,934
Inventories 450 (919)
Prepaid expenses and other current assets 7,434 164
Other assets 576 2,049
Accounts payable and accrued liabilities 815 8,367
Deferred revenue 733 (4,459)
Income taxes receivable 3,825 9,105
Income taxes payable 5,858 9,445
Other liabilities (327) (346)
Net cash provided by operating activities 196,951 200,650
Cash flows from investing activities:    
Purchases of property and equipment (28,526) (56,504)
Proceeds from sale of property and equipment 1,572 20,385
Purchases of assets and liabilities in connection with acquisition, net of cash acquired (180) (34,582)
Net cash used in investing activities (27,134) (70,701)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 9,327 5,878
Excess tax benefit from stock-based payment arrangements 2,696 2,925
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,019 1,077
Repurchases of common stock (137,655) (603,442)
Proceeds from the issuance of long-term debt 125,000 400,000
Debt offering costs (313) (2,023)
Principal payments on long-term debt (37,500) (12,500)
Net cash used in financing activities (37,426) (208,085)
Effect of foreign currency translation 734 2,096
Net increase (decrease) in cash and cash equivalents 133,125 (76,040)
Cash and cash equivalents at beginning of period 74,009 268,188
Cash and cash equivalents at end of period 207,134 192,148
Supplemental disclosure of cash flow information:    
Interest paid 8,227 1,793
Income taxes paid $ 75,800 $ 57,440