Long-Lived Assets - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment
Gross property, plant and equipment	$ 463,687	$ 429,459
Less accumulated depreciation	(256,895)	(243,741)
Net property, plant and equipment	206,792	185,718
Depreciation expense	41,900	35,800	$ 33,800
Land and Land Improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 12,380	15,904
Land and Land Improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	15 years
Land and Land Improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years
Building and Building Improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 70,724	69,645
Building and Building Improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	5 years
Building and Building Improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years
Equipment and Vehicles
Property, Plant and Equipment
Gross property, plant and equipment	$ 267,893	239,759
Equipment and Vehicles | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Equipment and Vehicles | Maximum
Property, Plant and Equipment
Estimated useful lives	20 years
Dies and Molds
Property, Plant and Equipment
Gross property, plant and equipment	$ 86,941	85,880
Dies and Molds | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Dies and Molds | Maximum
Property, Plant and Equipment
Estimated useful lives	20 years
Construction in Progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 25,749	$ 18,271