Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts - Notional Amount of Sell Currency (Details) - Not Designated as Hedging Instrument - Short ₪ in Thousands, ₩ in Thousands, ¥ in Thousands, £ in Thousands, TWD in Thousands, NOK in Thousands, $ in Thousands	Jun. 30, 2017 ILS (₪)	Jun. 30, 2017 CNY (¥)	Jun. 30, 2017 NOK	Jun. 30, 2017 GBP (£)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 TWD	Sep. 30, 2016 ILS (₪)	Sep. 30, 2016 CNY (¥)	Sep. 30, 2016 KRW (₩)	Sep. 30, 2016 NOK	Sep. 30, 2016 GBP (£)	Sep. 30, 2016 USD ($)
Foreign Currency Contract, Buy Japanese Yen, Sell United States Dollar, Maturing July 2017
Derivative [Line Items]
Notional Amount					$ 3,980
Foreign Currency Contract, Buy British Pound, Sell United States Dollar, Maturing July 2017
Derivative [Line Items]
Notional Amount					1,906
Foreign Currency Contract, Buy Korean Won, Sell United States Dollar, Maturing July 2017
Derivative [Line Items]
Notional Amount					3,679
Foreign Currency Contract, Buy United States Dollar, Sell Chinese Yuan, Maturing July 2017
Derivative [Line Items]
Notional Amount | ¥		¥ 40,000
Foreign Currency Contract, Buy Euro, Sell United States Dollar, Maturing July 2017
Derivative [Line Items]
Notional Amount					13,229
Foreign Currency Contract, Buy British Pound, Sell Norwegian Krone, Maturing July 2017
Derivative [Line Items]
Notional Amount | NOK			NOK 1,800
Foreign Currency Contract, Buy Singapore Dollar, Sell United States Dollar, Maturing July 2017
Derivative [Line Items]
Notional Amount					$ 449
Foreign Currency Contract, Buy United States Dollar, Sell Israeli Shekel, Maturing July 2017
Derivative [Line Items]
Notional Amount | ₪	₪ 748
Foreign Currency Contract, Buy Euro Sell British Pound, Maturing July 2017
Derivative [Line Items]
Notional Amount | £				£ 16,280
Foreign Currency Contract, Buy British Pound, Sell Swedish Krona, Maturing October 2016
Derivative [Line Items]
Notional Amount | ₩									₩ 2,100
Foreign Currency Contract, Buy Japanese Yen, Sell United States Dollar, Maturing October 2016
Derivative [Line Items]
Notional Amount												$ 1,229
Foreign Currency Contract, Buy United States Dollar, Sell British Pound, Maturing October 2016
Derivative [Line Items]
Notional Amount | £											£ 4,710
Foreign Currency Contract, Buy Euro, Sell United States Dollar, Maturing October 2016
Derivative [Line Items]
Notional Amount												14,976
Foreign Currency Contract, Buy United States Dollar, Sell Chinese Yuan, Maturing October 2016
Derivative [Line Items]
Notional Amount | ¥								¥ 39,000
Foreign Currency Contract, Buy Korean Won, Sell United States Dollar, Maturing October 2016
Derivative [Line Items]
Notional Amount												2,255
Foreign Currency Contract, Buy Euro, Sell British Pound, Maturing October 2016
Derivative [Line Items]
Notional Amount | £											£ 6,500
Foreign Currency Contract, Buy United States Dollar, Sell Israeli Shekel, Maturing October 2016
Derivative [Line Items]
Notional Amount | ₪							₪ 1,169
Foreign Currency Contract, Buy Singapore Dollar, Sell United States Dollar, Maturing October 2016
Derivative [Line Items]
Notional Amount												$ 265
Foreign Currency Contract, Buy United States Dollar, Sell Taiwanese Dollar, Maturing October 2016
Derivative [Line Items]
Notional Amount | TWD						TWD 6,600
Foreign Currency Contract, Buy British Pound, Sell Norwegian Krone, Maturing October 2016
Derivative [Line Items]
Notional Amount | NOK										NOK 1,800