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Income Taxes (Detail Textuals) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
TCJA remeasurement of deferred tax assets and liabilities     $ 2,450
TCJA deemed repatriation tax expense     4,249
Provision for income taxes and reduction in accumulated other comprehensive income     527
Provision for income taxes and reduction in deferred tax assets for remeasurement of deferred tax assets to reflect a reduced income tax rate in certain international jurisdictions     1,000
TCJA change in tax rate adjustment income tax expense (benefit) exercise of employee stock options $ 387 $ 460 $ (2,359)
Fiscal year ending June 30, 2018 | Forecast      
Income Tax Disclosure [Line Items]      
FY 2018 Weighted average income tax rate     28.10%
Fiscal year beginning July 1, 2018      
Income Tax Disclosure [Line Items]      
FY 2019 statutory federal income tax rate     21.00%