Intangibles (detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Jul. 31, 2014	Oct. 31, 2014 Patents [Member]	Jul. 31, 2014 Patents [Member]	Oct. 31, 2014 Trademarks and other [Member]	Jul. 31, 2014 Trademarks and other [Member]	Oct. 31, 2014 Customer relationships [Member]	Jul. 31, 2014 Customer relationships [Member]	Oct. 31, 2014 Non-compete agreements and other [Member]	Jul. 31, 2014 Non-compete agreements and other [Member]	Oct. 31, 2014 Trademarks [Member]	Jul. 31, 2014 Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period				5 years	5 years	5 years	5 years	7 years	7 years	4 years	4 years
Gross Carrying Amount	$ 210,148		$ 235,865	$ 11,708	$ 11,656	$ 15,002	$ 15,366	$ 143,903	$ 168,525	$ 9,841	$ 10,089	$ 29,694	$ 30,229
Accumulated Amortization	(123,497)		(144,851)	(10,257)	(10,160)	(11,071)	(10,706)	(92,472)	(114,363)	(9,697)	(9,622)	0	0
Net Book Value	86,651		91,014	1,451	1,496	3,931	4,660	51,431	54,162	144	467	29,694	30,229
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization of Intangible Assets	3,369	5,077
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	12,212
Finite-Lived Intangible Assets, Amortization Expense, Year Two	10,051
Finite-Lived Intangible Assets, Amortization Expense, Year Three	7,616
Finite-Lived Intangible Assets, Amortization Expense, Year Four	6,771
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 6,451