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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Cash flows from operating activities:    
Net income $ 127,644 $ 138,721
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 40,349 42,248
Allowance for doubtful accounts 936 234
Impairment of long-lived assets 29,104  
Stock-based compensation 17,262 14,671
Excess benefits from stock-based compensation (1,219) (6,164)
Gain on sale of property and equipment (1,696) (922)
Deferred income taxes (12,609) (3,372)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (9,161) (24,414)
Vehicle pooling costs (1,609) (2,197)
Inventories 1,439 (2,107)
Prepaid expenses and other current assets (3,539) (2,877)
Other assets (12,133) (6,145)
Accounts payable and accrued liabilities 15,269 21,966
Deferred revenue 316 15
Income taxes receivable 7,305 4,213
Income taxes payable 8,229 8,695
Other liabilities 1,747 438
Net cash provided by operating activities 207,634 183,003
Cash flows from investing activities:    
Purchases of property and equipment (63,317) (114,265)
Proceeds from sale of property and equipment 2,413 2,281
Proceeds from sale of assets held for sale 858 3,189
Purchases of assets and liabilities in connection with acquisition, net of cash acquired (14,761) (31,243)
Net cash used in investing activities (74,807) (140,038)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 5,680 19,579
Excess tax benefit from stock-based payment compensation 1,219 6,164
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,115 951
Repurchases of common stock (80) (14,512)
Change in bank overdraft (16,291)   
Principal payments on long-term debt (56,250) (56,255)
Net cash used in financing activities (64,607) (44,073)
Effect of foreign currency translation 981 327
Net increase (decrease) in cash and cash equivalents 69,201 (781)
Cash and cash equivalents at beginning of period 63,631 140,112
Cash and cash equivalents at end of period 132,832 139,331
Supplemental disclosure of cash flow information:    
Interest paid 6,599 7,758
Income taxes paid $ 65,769 $ 68,179