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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net Income $ 52,615 $ 41,422
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,967 14,504
Allowance for doubtful accounts 113 350
Stock-based compensation 4,366 4,867
Excess tax benefit from stock-based payment compensation (361) (58)
Gain on sale of property and equipment (261) (674)
Deferred income taxes (1,295) (3,010)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (9,004) (4,706)
Vehicle pooling costs 825 (693)
Inventories (553) 1,759
Prepaid expenses and other current assets 633 (3,699)
Other assets 2,586 (15,027)
Accounts payable and accrued liabilities (79) 6,483
Deferred revenue (353) (654)
Income taxes receivable 2,236 7,633
Income taxes payable 18,434 16,909
Other liabilities (503) 2,309
Net cash provided by operating activities 83,366 67,715
Cash flows from investing activities:    
Purchases of property and equipment (23,388) (21,302)
Proceeds from sale of property and equipment 472 853
Proceeds from sale of assets held for sale 217   
Purchases of assets and liabilities in connection with acquisition, net of cash acquired    (293)
Net cash used in investing activities (22,699) (20,742)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 1,931 82
Excess tax benefit from stock-based payment compensation 361 58
Repurchases of common stock (1,121) (80)
Change in bank overdraft    (16,291)
Principal payments on long-term debt (18,750) (18,750)
Net cash used in financing activities (17,579) (34,981)
Effect of foreign currency translation (3,272) 1,429
Net increase in cash and cash equivalents 39,816 13,421
Cash and cash equivalents at beginning of period 158,668 63,631
Cash and cash equivalents at end of period 198,484 77,052
Supplemental disclosure of cash flow information:    
Interest paid 1,910 2,286
Income taxes paid, net of refunds $ 10,030 $ 1,548