Property, Plant, and Equipment and Related Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands		Jan. 31, 2017	Jul. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		$ 139,819	$ 140,669
Less: accumulated depreciation and amortization		(69,834)	(65,958)
Property plant and equipment excluding construction in progress		69,985	74,711
Construction-in-progress		6,878	5,028
Property, plant and equipment, net	[1]	76,863	79,739
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		9,528	9,765
Buildings and improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		38,422	39,974
Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		89,409	88,470
Leasehold improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		$ 2,460	$ 2,460

[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 and January 31, 2017. Assets held for sale are included in prepaid expenses and other in current assets. The Company expects the sale of the properties to be completed during fiscal year 2017. The fair value measurements were based on recent valuation appraisals.