Related Party Transactions (Details) (USD $)	12 Months Ended
	Sep. 30, 2012 Carlyle	Sep. 30, 2011 Carlyle	Sep. 30, 2012 Rudolph Management Associates, Inc.	Sep. 30, 2011 Rudolph Management Associates, Inc.	Sep. 30, 2010 Rudolph Management Associates, Inc. Predecessor	Sep. 30, 2012 Arthur Rudolph, father of the President of Rudolph Management Associates, Inc.	Sep. 30, 2011 Gail Radvin, Inc.	Sep. 30, 2010 Gail Radvin, Inc. Predecessor
Related party transactions
Expected annual consulting fee	$ 3,000,000	$ 3,000,000
Expenses incurred from transactions with related party	3,000,000		113,000	450,000	450,000	6,000	207,000	721,000
One-time transaction fee paid upon effectiveness of the merger		30,000,000
Portion of transaction fee recorded in merger expenses		14,324,000
Portion of transaction fee included in deferred financing costs		$ 15,676,000