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INCOME TAXES: (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2017
Income Tax Disclosure [Abstract]          
Income tax (benefit) expense $ 3,858 $ 6,317 $ 7,317 $ 4,926  
Effective tax rate (as a percent) (26.50%) 149.20% (73.00%) 174.00%  
Forecast          
Subsequent Event [Line Items]          
Other noncash income tax expense         $ 7,700