Fair Value of Financial Instruments (Details 3) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended
	Dec. 31, 2010 Interest rate swaps USD ($) contract	Jun. 30, 2011 Interest rate swaps USD ($)	Jun. 30, 2012 Interest rate swaps USD ($)	Mar. 31, 2011 Interest rate swaps contract	Jun. 30, 2012 Interest rate swaps December 2012 USD ($)	Jun. 30, 2012 Interest rate swaps December 2013 USD ($)	Jun. 30, 2012 Cross currency swaps USD ($)	Jun. 30, 2012 Cross currency swaps USD ($)	Jun. 30, 2012 Cross currency swaps GBP (£)	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
Notional amount of each derivative contract		333,333						305,000	194,200
Notional amount of derivative contracts			1,000,000		266,666	166,666
Fixed interest rate (as a percent)			1.92%
Derivative term			4 years
Forward rate							1.565	1.565	1.565
Hedge ineffectiveness resulted in an expense							$ 1,524	$ 2,516