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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net income $ 41,422 $ 45,845
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 14,504 12,839
Allowance for doubtful accounts 350   
Stock-based compensation 4,867 5,174
Excess benefits from stock-based compensation (58) (1,922)
Loss on sale of property and equipment (674) (204)
Deferred incomes taxes (3,010) (3,778)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (4,706) (9,596)
Vehicle pooling costs (693) (29)
Inventories 1,759 1,011
Prepaid expenses and other current assets (3,699) (635)
Other assets (15,027) (6,039)
Accounts payable and accrued liabilities 6,483 8,108
Deferred revenue (654) (174)
Income taxes receivable 7,633 3,067
Income taxes payable 16,909 21,517
Other liabilities 2,309 131
Net cash provided by operating activities 67,715 75,315
Cash flows from investing activities:    
Purchases of property and equipment (21,302) (47,620)
Proceeds from sale of property and equipment 853 33
Proceeds from sale of assets held for sale    861
Investment in escrow    (11,167)
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (293) (449)
Net cash used in investing activities (20,742) (58,342)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 82 4,148
Excess tax benefit from stock-based payment compensation 58 1,922
Repurchases of common stock (80) (13,885)
Change in bank overdraft (16,291)   
Principal payments on long-term debt (18,750) (18,755)
Net cash used in financing activities (34,981) (26,570)
Effect of foreign currency translation 1,429 915
Net increase (decrease) in cash and cash equivalents 13,421 (8,682)
Cash and cash equivalents at beginning of period 63,631 140,112
Cash and cash equivalents at end of period 77,052 131,430
Supplemental disclosure of cash flow information:    
Interest paid 2,286 2,584
Income taxes paid $ 1,548 $ 4,949