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Uncompleted Contracts - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Customer Contracts [Line Items]          
Contract Receivable Retainage, Due in Next Twelve Months $ 25.3   $ 25.3   $ 25.2
Contract Receivable Retainage, Due after Next Twelve Months 5.6   5.6   $ 2.8
Change In Accounting Estimate, Financial Effect, Operating Income $ 5.4 $ 22.9 $ 5.5 $ 26.2  
Change in Accounting Estimate, Financial Effect, Net Income 9.0 7.9 2.0 9.0