Segment and Geographic Information - Long-Lived Assets, Consisting of Property, Plant and Equipment by Geographic Area (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	$ 54,885	$ 41,855
North America
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	49,505	36,402
Asia/Pacific
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	952	2,104
Europe
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	$ 4,428	$ 3,349