Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Cash flows from operating activities:
Net income	$ 38,925	$ 41,108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,324	3,414
Amortization of intangible assets	3,689	2,902
Impairment charges		710
Deferred income tax provision	1,177	1,266
Gain on disposal of bus business		(7,825)
(Gain) loss on disposition of property, plant and equipment	(13)	34
Stock-based compensation expense	1,565	1,376
Excess tax benefits from stock-based awards	(114)	(737)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	35,870	21,110
Inventories	(5,497)	(43,288)
Prepaid income taxes, expenses and other	(4,267)	(1,860)
Accounts payable	(13,743)	3,916
Accrued liabilities	(7,479)	(14,264)
Other liabilities	(3,412)	(2,009)
Net cash provided by operating activities	50,025	5,853
Cash flows from investing activities:
Purchases of property, plant and equipment	(8,541)	(5,131)
Proceeds from dispositions of property, plant and equipment	13	65
Proceeds from dispositions of investments		700
Proceeds from notes receivable		2,700
Proceeds from sale of bus business		97,677
Acquisitions, net of cash acquired	(2,915)	(33,774)
Other	7	219
Net cash provided by (used in) investing activities	(11,436)	62,456
Cash flows from financing activities:
Regular cash dividends paid	(14,412)	(12,253)
Excess tax benefits from stock-based awards	114	737
Proceeds from issuance of common stock		2,293
Payments related to vesting of stock-based awards		(705)
Net cash used in financing activities	(14,298)	(9,928)
Net increase in cash and cash equivalents	24,291	58,381
Cash and cash equivalents, beginning of period	289,336	236,601
Cash and cash equivalents, end of period	313,627	294,982
Supplemental cash flow information:
Income taxes paid	36,246	34,970
Interest paid		132
Non-cash transactions:
Capital expenditures in accounts payable	353	1,518
Other accounts receivable from disposal of bus business		8,329
Special dividend payable		$ 53,290