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Pension Plan (Details)
$ in Thousands
12 Months Ended
Mar. 16, 2018
USD ($)
Mar. 31, 2018
USD ($)
participant
Jun. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Number of pension plan participants authorized to terminate from Scheme | participant   60  
Contributions paid $ 11,000    
Accumulated other comprehensive loss   $ (11,361) $ (13,518)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss     $ (11,200)