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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Jun. 24, 2018
Income Tax Disclosure [Abstract]      
U.S. Federal corporate income tax rate 21.00% 35.00%  
Tax benefit resulting from re-measurement of deferred tax assets and liabilities     $ 4,297
Tax expense, net of foreign tax credits     $ 3,901