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Other Long Term Liabilities - Summary of Other Long Term Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Jun. 30, 2015
Other Liabilities Disclosure [Abstract]    
Pension obligation $ 4.8 $ 4.9
Other 2.0 3.9
Total other long term liabilities $ 6.8 $ 8.8