Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Cash flows from operating activities:
Net Income	$ 52,413	$ 52,615
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,562	13,967
Allowance for doubtful accounts	1,032	113
Equity in losses of unconsolidated affiliates	158	0
Stock-based payment compensation	5,414	4,366
Excess tax benefit from stock-based payment compensation	(197)	(361)
Gain on sale of property and equipment	(60)	(261)
Deferred income taxes	(870)	(1,295)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(16,910)	(9,004)
Vehicle pooling costs	(1,741)	825
Inventories	(511)	(553)
Prepaid expenses and other current assets	(1,115)	633
Other assets	(1,036)	2,586
Accounts payable and accrued liabilities	77	(79)
Deferred revenue	(5)	(353)
Income taxes receivable	5,333	2,236
Income taxes payable	23,483	18,434
Other liabilities	(433)	(503)
Net cash provided by operating activities	76,594	83,366
Cash flows from investing activities:
Purchases of property and equipment	(20,167)	(23,388)
Proceeds from sale of property and equipment	343	472
Proceeds from sale of assets held for sale	100	217
Purchases of marketable securities	(21,119)	0
Net cash used in investing activities	(40,843)	(22,699)
Cash flows from financing activities:
Proceeds from the exercise of stock options	368	1,931
Excess tax benefit from stock-based payment compensation	197	361
Repurchases of common stock	0	(1,121)
Principal payments on long-term debt	(18,750)	(18,750)
Net cash used in financing activities	(18,185)	(17,579)
Effect of foreign currency translation	(662)	(3,272)
Net increase in cash and cash equivalents	16,904	39,816
Cash and cash equivalents at beginning of period	456,012	158,668
Cash and cash equivalents at end of period	472,916	198,484
Supplemental disclosure of cash flow information:
Interest paid	5,723	1,910
Income taxes paid, net of refunds	$ 1,292	$ 10,030