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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Cash flows from operating activities:      
Net income $ 180,025 $ 182,119 $ 166,375
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 56,728 48,167 45,694
Allowance for doubtful accounts (356) (192) 270
Impairment of long-lived assets   8,771  
Stock-based compensation 19,557 21,791 19,007
Excess tax benefits from stock-based compensation (6,097) (4,367) (3,547)
(Gain)/loss on sale of property and equipment (962) (143) 1,882
Deferred income taxes (3,605) (17,579) (2,099)
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable (31,171) (16,004) (12,506)
Vehicle pooling costs (3,626) 1,142 13,201
Inventories (1,777) (218) (2,666)
Prepaid expenses and other current assets (5,971) 6,026 4,785
Other assets (18,714) (1,951) 739
Accounts payable and accrued liabilities 14,749 (3,805) 5,255
Deferred revenue (871) (243) (5,015)
Income taxes receivable (752) 7,082 9,456
Income taxes payable 1,609 (2,545) 2,529
Other liabilities 560 1,622 (428)
Net cash provided by operating activities 199,326 229,673 242,932
Cash flows from investing activities:      
Purchases of property and equipment (130,265) (54,832) (70,170)
Proceeds from sale of property and equipment 3,077 1,268 20,602
Proceeds from sale of assets held for sale 3,189 8,041  
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (84,022) (2,564) (34,912)
Net cash used in investing activities (208,021) (48,087) (84,480)
Cash flows from financing activities:      
Proceeds from the exercise of stock options 21,442 13,651 7,082
Excess tax benefits from stock-based compensation 6,097 4,367 3,547
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,948 1,957 1,957
Repurchases of common stock (15,009) (203,285) (739,638)
Change in bank overdraft 16,291    
Proceeds from issuance of long-term debt   125,000 400,000
Debt offering costs   (313) (2,023)
Principal payments on long-term debt (96,660) (56,250) (25,000)
Net cash used in financing activities (65,891) (114,873) (354,075)
Effect of foreign currency translation (1,895) (610) 1,444
Net (decrease) increase in cash and cash equivalents (76,481) 66,103 (194,179)
Cash and cash equivalents at beginning of period 140,112 74,009 268,188
Cash and cash equivalents at end of period 63,631 140,112 74,009
Supplemental disclosure of cash flow information:      
Interest paid 10,267 11,333 3,894
Income taxes paid $ 95,182 $ 106,581 $ 85,145