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Intangible Assets Including Goodwill - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]      
Impairment charge $ 25.0    
Amortization expense   0 0.2
2013 0.5 0.5  
2014 0.6 0.6  
2015 0.6 0.6  
2016 0.6 0.6  
2017 0.5 0.5  
Customer Relationships [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Fair value of amortizing intangible assets 1.6 1.6  
Weighted average amortization period of intangible assets   15 years  
Other Intangible Assets [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Fair value of amortizing intangible assets $ 0.3 $ 0.3  
Weighted average amortization period of intangible assets   5 years