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Derivatives (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Jul. 31, 2017
Options | Cash flow hedges | Cost of goods sold        
Derivative [Line Items]        
Gain (loss) on matured contracts, record to Inventory $ 1,622   $ 966  
Recognize gains in costs of goods sold in next six months 780      
Options | Cash flow hedges | Cost of goods sold | Brazilian Real calls        
Derivative [Line Items]        
Realized losses on hedging derivatives recognized in cost of goods sold 186 $ (1,135)    
Options | Cash flow hedges | Other comprehensive income (loss)        
Derivative [Line Items]        
Fair value of foreign currency option that is included accumulated other comprehensive income $ 1,781      
Interest rate swap        
Derivative [Line Items]        
Percentage of interest rate       1.8325%
Derivative, notional amount       $ 150,000