Market Risks and Derivative Hedge Contracts (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Total	$ 348,000			$ 290,000
Derivative [Line Items]
Net gains associated with foreign currency derivatives	700,000	$ (100,000)
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 5,250,000
Traded exchange rate	1.22
Value date	Apr. 19, 2017
Forward Purchase Contract, Brazil Real [Member]
Derivative [Line Items]
U.S. Dollar notional amount			$ 1,513,000
Traded exchange rate			1.35
Value date			Apr. 19, 2017
Forward Purchase Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 7,740,000
Traded exchange rate	19.64
Value date	Apr. 19, 2017
Forward Sale Contract, Mexican Pesos (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,485,000
Traded exchange rate	19.64
Value date	Apr. 19, 2017
Forward Purchase Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 781,000
Traded exchange rate	1.07
Value date	Apr. 19, 2017
Forward Sale Contract, Norwegian Krone [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 3,032,000
Traded exchange rate	8.58
Value date	Apr. 19, 2017
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	$ 492,000			81,000
Forward sale contracts	0			0
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	(1,000)			(371,000)
Forward sale contracts	$ (143,000)			$ 0