Property, Plant, and Equipment and Related Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands		Jan. 31, 2018	Jul. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		$ 182,932	$ 172,739
Less: accumulated depreciation and amortization		(85,354)	(76,974)
Property plant and equipment excluding construction in progress		97,578	95,765
Construction-in-progress		11,376	9,670
Property, plant and equipment, net	[1]	108,954	105,435
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		13,128	12,632
Buildings and improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		53,302	50,973
Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		113,725	106,379
Leasehold improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		$ 2,777	$ 2,755

[1] In fiscal year 2016, as part of the Company’s ongoing review of its Milan production facilities, the Company determined that certain other facilities had excess capacity sufficient to absorb the manufacturing operations of one of its Milan plants. As a result, the Company committed to sell properties with a total estimated fair value, less costs to sell, of approximately $4.3 million at July 31, 2016. Assets held for sale are included in prepaid expenses and other in current assets. The Company obtained an updated third party market analysis on the property and has increased marketing and advertising efforts to sell the property.