Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 2,900	$ 2,900	$ 0
Loss on Write-down, Assets Held-for-sale		1,900
Depreciation expense		12,300	$ 12,700	$ 13,700
Property, Plant and Equipment, Additions	8,400
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring
Property, Plant and Equipment [Line Items]
Assets held for sale	2,900	2,900
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Buildings and land
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 4,800	$ 4,800