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Intangible Assets Including Goodwill - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Impairment charge [1] $ 25.0    
Amortization expense $ 0.8 $ 1.2  
Minimum [Member] | Intellectual Property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 6 years   6 years
Minimum [Member] | Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year 6 months   1 year 6 months
Minimum [Member] | Noncompete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 4 years   4 years
Minimum [Member] | Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 3 years   3 years
Maximum [Member] | Intellectual Property [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years   15 years
Maximum [Member] | Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years   15 years
Maximum [Member] | Noncompete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years   5 years
Maximum [Member] | Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years   5 years
[1] A $25.0 million impairment charge was recorded in February 2005.