Goodwill and Intangible Assets - Other Intangible Asset (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, 2013	Oct. 31, 2012	Jul. 31, 2013	Oct. 31, 2013 Patents [Member]	Jul. 31, 2013 Patents [Member]	Oct. 31, 2013 Trademarks and other [Member]	Jul. 31, 2013 Trademarks and other [Member]	Oct. 31, 2013 Customer relationships [Member]	Jul. 31, 2013 Customer relationships [Member]	Oct. 31, 2013 Non-compete agreements and other [Member]	Jul. 31, 2013 Non-compete agreements and other [Member]	Oct. 31, 2013 Trademarks [Member]	Jul. 31, 2013 Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 5,077	$ 4,147
Weighted Average Amortization Period				5 years	5 years	5 years	5 years	8 years	8 years	4 years	4 years
Gross Carrying Amount	337,865		333,681	11,125	11,053	15,809	15,289	264,430	261,076	15,263	14,942	31,238	31,321
Accumulated Amortization	(185,053)		(176,830)	(9,737)	(9,597)	(9,207)	(8,398)	(151,475)	(144,620)	(14,634)	(14,215)	0	0
Net Book Value	152,812		156,851	1,388	1,456	6,602	6,891	112,955	116,456	629	727	31,238	31,321
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	19,629
Finite-Lived Intangible Assets, Amortization Expense, Year Two	18,800
Finite-Lived Intangible Assets, Amortization Expense, Year Three	16,598
Finite-Lived Intangible Assets, Amortization Expense, Year Four	13,357
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 12,007