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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Cash flows from operating activities:      
Net income $ 182,119 $ 166,375 $ 151,627
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 48,167 45,694 43,242
Allowance for doubtful accounts (192) 270 442
Impairment of long-lived assets 8,771    
Stock-based compensation 21,791 19,007 17,955
Excess benefits from stock-based compensation (4,367) (3,547) (5,643)
(Gain)/loss on sale of property and equipment (143) 1,882 659
Deferred income taxes (17,579) (2,099) (4,512)
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable (16,202) (12,865) 2,436
Vehicle pooling costs 1,142 13,201 (1,210)
Inventories (218) (2,666) (256)
Prepaid expenses and other current assets 6,026 4,785 (8,896)
Other assets (1,951) 739 311
Accounts payable and accrued liabilities (3,607) 5,614 8,098
Deferred revenue (243) (5,015) (2,527)
Income taxes receivable 7,082 9,456 861
Income taxes payable (2,545) 2,529 (2,740)
Other liabilities 1,622 (428) (440)
Net cash provided by operating activities 229,673 242,932 199,407
Cash flows from investing activities:      
Issuance of notes receivable     (1,300)
Purchases of property and equipment (54,832) (70,170) (75,840)
Proceeds from sale of property and equipment 1,268 20,602 2,477
Proceeds from sale of assets held for sale 8,041    
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (2,564) (34,912) (21,362)
Net cash used in investing activities (48,087) (84,480) (96,025)
Cash flows from financing activities:      
Proceeds from the exercise of stock options 13,651 7,082 6,285
Excess tax benefit from stock-based payment compensation 4,367 3,547 5,643
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,957 1,957 2,044
Repurchases of common stock (203,285) (739,638) (12,706)
Proceeds from issuance of long-term debt 125,000 400,000  
Debt offering costs (313) (2,023)  
Principal payments on long-term debt (56,250) (25,000)  
Net cash (used in) provided by financing activities (114,873) (354,075) 1,266
Effect of foreign currency translation (610) 1,444 849
Net increase (decrease) in cash and cash equivalents 66,103 (194,179) 105,497
Cash and cash equivalents at beginning of period 74,009 268,188 162,691
Cash and cash equivalents at end of period 140,112 74,009 268,188
Supplemental disclosure of cash flow information:      
Interest paid 11,333 3,894 216
Income taxes paid $ 106,581 $ 85,145 $ 93,989