Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Cash flows from operating activities:
Net income	$ 57,300	$ 50,884
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	6,393	6,892
Amortization of intangibles	6,128	5,562
Impairment charges	710
Deferred income tax provision (benefit)	4,102	(206)
Gain on disposal of bus business	(7,079)
Gain on disposition of property, plant and equipment	(40)	(12)
Stock-based compensation	2,648	1,312
Excess tax benefits from stock-based awards	(796)	(567)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	30,249	(18,230)
Inventories	(67,997)	(47,314)
Prepaid income taxes, expenses and other	(14,550)	(9,047)
Accounts payable	(7,159)	22,233
Accrued liabilities	(22,772)	(8,555)
Other liabilities	(4,982)	(1,619)
Net cash provided by (used in) operating activities	(17,845)	1,333
Cash flows from investing activities:
Purchases of property, plant and equipment	(12,671)	(9,908)
Proceeds from dispositions of property, plant and equipment	561	188
Proceeds from dispositions of investments	700	400
Proceeds from notes receivable	6,425	7,000
Proceeds from sale of bus business	100,000
Acquisitions, net of cash acquired	(33,487)	(10,718)
Other	340	148
Net cash provided by (used in) investing activities	61,868	(12,890)
Cash flows from financing activities:
Regular cash dividends paid	(24,510)	(19,069)
Special cash dividends paid	(53,290)	(79,525)
Shares repurchased related to cashless exercises of stock options		(2,009)
Excess tax benefits from stock-based awards	796	567
Proceeds from issuance of common stock	2,491	1,091
Payments related to vesting of stock-based awards	(1,251)
Net cash used in financing activities	(75,764)	(98,945)
Net decrease in cash and cash equivalents	(31,741)	(110,502)
Cash and cash equivalents, beginning of period	236,601	218,642
Cash and cash equivalents, end of period	204,860	108,140
Supplemental cash flow information:
Income taxes paid	54,698	42,686
Interest paid	132	167
Non-cash transactions:
Capital expenditures in accounts payable	811	564
Other accounts receivable from bus business sale	$ 5,043