Long-Lived Assets (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment
Gross property, plant and equipment	$ 406,817,000	$ 368,413,000
Less accumulated depreciation	(224,706,000)	(208,794,000)
Net property, plant and equipment	182,111,000	159,619,000
Depreciation expense	33,800,000	32,100,000	30,800,000
Land and Land Improvements
Property, Plant and Equipment
Gross property, plant and equipment	15,298,000	11,359,000
Land and Land Improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	15 years	15 years
Land and Land Improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years	40 years
Building and Building Improvements
Property, Plant and Equipment
Gross property, plant and equipment	69,018,000	61,760,000
Building and Building Improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	5 years	5 years
Building and Building Improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years	40 years
Equipment and Vehicles
Property, Plant and Equipment
Gross property, plant and equipment	222,800,000	204,438,000
Equipment and Vehicles | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years	3 years
Equipment and Vehicles | Maximum
Property, Plant and Equipment
Estimated useful lives	20 years	20 years
Dies and Molds
Property, Plant and Equipment
Gross property, plant and equipment	83,299,000	79,248,000
Dies and Molds | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years	3 years
Dies and Molds | Maximum
Property, Plant and Equipment
Estimated useful lives	20 years	20 years
Construction in Progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 16,402,000	$ 11,608,000