Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	$ 1,895	$ 2,633
Intangible Assets, Amortization Expense, Next Twelve Months	7,238
Intangible Assets, Amortization Expense, Year Two	6,551
Intangible Assets, Amortization Expense, Year Three	6,283
Intangible Assets, Amortization Expense, Year Four	5,789
Intangible Assets, Amortization Expense, Year Five	5,743
Other Intangible Assets [Line Items]
Gross Carrying Amount	192,856		$ 194,550
Accumulated Amortization	(135,266)		(134,744)
Net Book Value	$ 57,590		$ 59,806
Patents [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years		5 years
Gross Carrying Amount	$ 12,245		$ 12,252
Accumulated Amortization	(11,146)		(11,063)
Net Book Value	$ 1,099		$ 1,189
Trademarks and other [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years		5 years
Gross Carrying Amount	$ 14,019		$ 14,359
Accumulated Amortization	(13,704)		(13,709)
Net Book Value	$ 315		$ 650
Customer relationships [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	7 years		7 years
Gross Carrying Amount	$ 134,472		$ 135,795
Accumulated Amortization	(101,295)		(100,830)
Net Book Value	$ 33,177		$ 34,965
Non-compete agreements and other [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	4 years		4 years
Gross Carrying Amount	$ 9,129		$ 9,153
Accumulated Amortization	(9,121)		(9,142)
Net Book Value	8		11
Trademarks [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount	22,991		22,991
Accumulated Amortization	0		0
Net Book Value	$ 22,991		$ 22,991