Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense		$ 13,100	$ 12,300	$ 12,700
Capital Expenditures Incurred but Not yet Paid		1,300
Additions to property plant and equipment	$ 8,400
Property, Plant and Equipment [Line Items]
Assets held for sale	2,900	0	2,900
Loss on Write-down, Assets Held-for-sale			1,900
Long Lived Assets Held-for-sale, Selling Price					$ 2,800
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 2,900		$ 2,900
Reported Value Measurement | Buildings and land
Property, Plant and Equipment [Line Items]
Assets held for sale		$ 4,800