Derivative Financial Instruments - Narrative (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 Cash Flow Hedging Foreign exchange forward currency contracts EUR (€)	Mar. 31, 2014 Revolving Credit Facility Cash Flow Hedging Interest rate swap one USD ($)	Mar. 31, 2014 Revolving Credit Facility Cash Flow Hedging Interest rate swap two USD ($)	Mar. 31, 2014 Revolving Credit Facility Restatement Agreement Cash Flow Hedging Interest rate swap one USD ($)	Sep. 30, 2014 Forecast Revolving Credit Facility Cash Flow Hedging Interest rate swap two
Derivative
Amount of hedged item						$ 250,000,000	$ 250,000,000	$ 250,000,000
Interest rate fixed as result of interest rate swap hedges						3.40%		2.90%	2.60%
Exchange rate					1.3659
Notional amount					69,000,000
Gain (loss) on cash flow hedge ineffectiveness	2,000	0	2,000	0
Gain (loss) recognized in income as a result of excluding amounts from the assessment of hedge effectiveness or as a result of reclassifications to earnings following the discontinuance of any cash flow hedges	0	0	0	0
Interest rate derivative contracts that will be reclassified to earnings during the next twelve months	1,300,000		1,300,000
Foreign exchange forward currency contracts that will be reclassified to earnings during the next twelve months	$ 500,000		$ 500,000