XML 67 R53.htm IDEA: XBRL DOCUMENT v3.10.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textual) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Summary Of Significant Accounting Policies [Line Items]      
U.S. Government Contracts as a percent of total revenue 93.50% 93.90%  
Amount of tax expense for changes in the fair value of interest rate swap agreements $ 4.2 $ 9.5 $ 3.9
Accumulated other comprehensive loss related to foreign currency translation adjustments (27.5) (29.5)  
Accumulated other comprehensive gain related to fair value of interest rate swaps 9.0 1.5  
Accumulated other comprehensive loss related to unrecognized post-retirement medical plan costs $ (0.5) $ (1.1)  
Equipment and furniture      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life from three to eight years    
Leasehold improvements      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life over the remaining lease term or the useful life of the improvements, whichever is shorter