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6. Income Taxes (Tables)
9 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate
  

Three Months Ended

March 31,

  

Nine Months Ended

March 31,

 
   2018   2017   2018   2017 
Effective tax rate   8%    12%    460%    26%