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Debt (Details Textual)
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2018
USD ($)
Rate
Jun. 30, 2017
USD ($)
Debt (Textual) [Abstract]      
Senior revolving credit facility | $   $ 300,000,000 $ 300,000,000
Line of Credit Facility, Expiration Date   Feb. 08, 2022  
Leverage Ratio, Maximum   3.00  
Leverage Ratio, Minimum   1.00  
Fixed Charge Coverage Ratio, Maximum   1.25  
Fixed Charge Coverage Ratio, Minimum   1.00  
Limit on asset dispositions | $   $ 20.0  
Sublimit on Australian Dollar, Canadian Dollar, Euro and Pounds Sterling | $   75.0  
Sublimit on letters of credit under the credit facility | $   $ 200.0  
Additional Margin on alternate base rate loans, Minimum   0.625%  
Additional Margin on alternate base rate loans, Maximum   1.625%  
Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Minimum   1.625%  
Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Maximum   2.625%  
Line Of Credit Basis Spread On Canadian Prime Rate Minimum   2.125%  
Line Of Credit Basis Spread On Canadian Prime Rate Maximum   3.125%  
Maximum limit of consolidated funded indebtedness   3.0  
Consolidated EBITDA as defined in the Credit Agreement | $   $ 36,800,000  
Consolidated Funded Indebtedness | $   $ 37,100,000  
Subsequent Events [Abstract]      
Subsequent Event, Description

   
Minimum [Member]      
Debt (Textual) [Abstract]      
Unused Credit Facility Fee   0.25%  
Maximum [Member]      
Debt (Textual) [Abstract]      
Unused Credit Facility Fee   0.45%