Fair Value of Financial Instruments (Details 3) £ in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 01, 2011	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 GBP (£)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2011 contract	Dec. 31, 2010 contract
Interest rate swaps
Derivative information
Number of derivative contracts entered into by the entity							3
Fixed interest rate (as a percent)							1.92%
Derivative term	4 years
Cross currency swaps
Derivative information
Number of derivative contracts entered into by the entity								3
Notional amount of each derivative contract				£ 194,200	$ 300,000
Forward rate (as a percent)		1.565		1.565	1.565
Cross currency swaps | Miscellaneous, net
Derivative information
Hedge ineffectiveness (gain) / loss | $		$ (613)	$ 1,463		$ 1,136	$ 2,415