Merger Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Sep. 30, 2010
Merger Expenses
Merger expenses	$ 614	$ 4,991	$ 38,874	$ 44,479	$ 45,903
Carlyle
Merger Expenses
Merger expenses				44,479
Costs associated with an unused bridge loan				15,660
Portion of transaction fee recorded in merger expenses				14,324
Employment agreement termination payment due to a former executive officer				6,929
Other merger related cost				7,566
Predecessor
Merger Expenses
Merger expenses					45,903
Legal and professional advisory services					29,761
Incremental stock-based compensation expense					16,142
Contingent amount upon closing of the Acquisition					$ 38,123