Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Jul. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	$ 1,693	$ 1,895
Intangible Assets, Amortization Expense, Next Twelve Months	6,445
Intangible Assets, Amortization Expense, Year Two	6,195
Intangible Assets, Amortization Expense, Year Three	5,196
Intangible Assets, Amortization Expense, Year Four	5,155
Intangible Assets, Amortization Expense, Year Five	5,008
Other Intangible Assets [Line Items]
Gross Carrying Amount	89,107		$ 89,685
Accumulated Amortization	(37,907)		(36,609)
Net Book Value	$ 51,200		$ 53,076
Patents [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years		5 years
Gross Carrying Amount	$ 1,395		$ 1,358
Accumulated Amortization	(591)		(471)
Net Book Value	$ 804		$ 887
Trademarks and other [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	9 years		9 years
Gross Carrying Amount	$ 4,485		$ 4,528
Accumulated Amortization	(4,271)		(4,229)
Net Book Value	$ 214		$ 299
Customer relationships [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	8 years		8 years
Gross Carrying Amount	$ 60,349		$ 60,759
Accumulated Amortization	(33,045)		(31,909)
Net Book Value	27,304		28,850
Trademarks [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount	22,878		23,040
Accumulated Amortization	0		0
Net Book Value	$ 22,878		$ 23,040