Fair Value of Financial Instruments (Details 3)	1 Months Ended	9 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2010 Interest rate swaps USD ($) contract	Jun. 30, 2013 Interest rate swaps USD ($)	Mar. 31, 2011 Interest rate swaps contract	Jun. 30, 2013 Interest rate swaps December 2012 USD ($)	Jun. 30, 2013 Interest rate swaps December 2013 USD ($)	Jun. 30, 2013 Cross currency swaps USD ($)	Jun. 30, 2012 Cross currency swaps USD ($)	Jun. 30, 2013 Cross currency swaps USD ($)	Jun. 30, 2013 Cross currency swaps GBP (£)	Jun. 30, 2012 Cross currency swaps USD ($)	Dec. 31, 2010 Cross currency swaps contract
Derivative information
Number of derivative contracts entered into by the entity	3		3								3
Payment on termination of derivative contract	$ 1,525,000
Notional amount of each derivative contract		333,333,000		266,666,000	166,666,000			300,000,000	194,200,000
Notional amount of derivative contracts		1,000,000,000
Fixed interest rate (as a percent)		1.92%
Derivative term		4 years
Forward rate						1.565		1.565	1.565
Hedge ineffectiveness (gain)/ loss						$ (2,065,000)	$ 1,524,000	$ (1,345,000)		$ 2,516,000