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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Income Taxes            
Statutory federal tax rate (as a percent) 21.00%   35.00% 24.50% 35.00% 24.50%
Effective tax rate (as a percent)   143.40% 50.60% (180.50%) 39.80%  
Increase in tax expense       $ 18,181    
Income (loss) before income taxes   $ (1,644) $ (8,023) $ (8,513) $ (10,839)