Goodwill And Other Intangible Assets (Components Of Amortizable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2012 Y	Jul. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 136,626	$ 138,010
Accumulated Amortization	19,644	12,755
Dealer Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	11
Cost	72,230	72,230
Accumulated Amortization	11,561	6,154
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	4
Cost	6,321	6,851
Accumulated Amortization	3,465	3,300
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	23
Cost	36,775	36,669
Accumulated Amortization	2,142	1,008
Design Technology And Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	13
Cost	21,300	22,260
Accumulated Amortization	$ 2,476	$ 2,293