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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities:    
Net income $ 86,767 $ 85,485
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 27,580 27,451
Allowance for doubtful accounts 884 184
Stock-based compensation 10,639 9,920
Excess benefits from stock-based compensation (1,171) (5,293)
Gain on sale of property and equipment (1,743) (183)
Deferred incomes taxes (5,982) (6,986)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (38,928) (58,315)
Vehicle pooling costs (3,034) (4,325)
Inventories 1,316 (2,535)
Prepaid expenses and other current assets (4,266) (3,529)
Other assets (12,602) (7,014)
Accounts payable and accrued liabilities 7,724 17,845
Deferred revenue 347 (28)
Income taxes receivable 4,799 (4,776)
Income taxes payable 1,494 4,918
Other liabilities 1,967 271
Net cash provided by operating activities 75,791 53,090
Cash flows from investing activities:    
Purchases of property and equipment (51,768) (85,682)
Proceeds from sale of property and equipment 2,082 990
Proceeds from sale of assets held for sale 494 861
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (14,228) (31,243)
Net cash used in investing activities (63,420) (115,074)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 4,550 16,358
Excess tax benefit from stock-based payment compensation 1,171 5,293
Proceeds from the issuance of Employee Stock Purchase Plan shares 1,115 951
Repurchases of common stock (80) (14,512)
Change in bank overdraft 743   
Principal payments on long-term debt (37,500) (37,505)
Net cash used in financing activities (30,001) (29,415)
Effect of foreign currency translation 198 797
Net decrease in cash and cash equivalents (17,432) (90,602)
Cash and cash equivalents at beginning of period 63,631 140,112
Cash and cash equivalents at end of period 46,199 49,510
Supplemental disclosure of cash flow information:    
Interest paid 4,495 5,220
Income taxes paid $ 47,891 $ 55,874