Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Jul. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	$ 1,436	$ 1,693
Intangible Assets, Amortization Expense, Next Twelve Months	5,713
Intangible Assets, Amortization Expense, Year Two	5,187
Intangible Assets, Amortization Expense, Year Three	5,148
Intangible Assets, Amortization Expense, Year Four	5,004
Intangible Assets, Amortization Expense, Year Five	2,025
Other Intangible Assets [Line Items]
Gross Carrying Amount	80,852		$ 81,460
Accumulated Amortization	(39,819)		(38,872)
Net Book Value	$ 41,033		$ 42,588
Patents [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years		5 years
Gross Carrying Amount	$ 1,448		$ 1,448
Accumulated Amortization	(1,069)		(942)
Net Book Value	$ 379		$ 506
Trademarks and other [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	9 years		9 years
Gross Carrying Amount	$ 4,416		$ 4,497
Accumulated Amortization	(4,332)		(4,395)
Net Book Value	$ 84		$ 102
Customer relationships [Member]
Other Intangible Assets [Line Items]
Weighted Average Amortization Period	9 years		9 years
Gross Carrying Amount	$ 55,559		$ 55,999
Accumulated Amortization	(34,418)		(33,535)
Net Book Value	21,141		22,464
Trademarks [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount	19,429		19,516
Accumulated Amortization	0		0
Net Book Value	$ 19,429		$ 19,516