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Uncompleted Contracts - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Jun. 30, 2015
Customer Contracts [Line Items]      
Contract Receivable Retainage, Due in Next Twelve Months   $ 26.3 $ 25.2
Contract Receivable Retainage, Due after Next Twelve Months   $ 1.0 $ 2.8
Change In Accounting Estimate, Financial Effect, Operating Income $ 3.3    
Change in Accounting Estimate, Financial Effect, Net Income 1.3