Property, Plant and Equipment - Schedule (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 169,019	$ 173,778
Less accumulated depreciation and amortization	(127,164)	(123,595)
Property, plant and equipment, net	41,855	50,183
Buildings and land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,765	47,639
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,715	59,962
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,185	42,104
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,310	4,774
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,617	17,771
Capital projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,427	$ 1,528