Share Based Awards (Details 2) (USD $)	6 Months Ended										12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Two Thousand Five Stock Options Plan [Member] Option Grant Date Twenty Five September Two Thousand Twelve [Member]		Sep. 30, 2012 Two Thousand Five Stock Options Plan [Member] May 24, 2012 [Member]		Sep. 30, 2012 Two Thousand Five Stock Options Plan [Member] May 24, 2012 (Second Stated Grant) [Member]		Sep. 30, 2012 Two Thousand Five Stock Options Plan [Member] May 23, 2012 [Member]		Sep. 30, 2012 Two Thousand Five Stock Options Plan [Member] Fiscal year 2013 option grants [Member]	Mar. 31, 2012 Two Thousand Five Stock Options Plan [Member] May 31, 2011 [Member]		Mar. 31, 2012 Two Thousand Five Stock Options Plan [Member] Fiscal year 2012 option grants [Member]
Summary of stock options granted
Option Grant Date				May 24, 2012		May 24, 2012		May 23, 2012			May 31, 2011
Number of Share Granted	511,500	20,000		346,000		30,000		115,500		511,500	459,400		459,400
Exercise Price Granted (in usd per share)		$ 18.42		$ 29.17		$ 29.17		$ 29.45			$ 43.04
Exercise of option grants		Five years	[1]	Five years	[1]	Five years	[1]	Four years	[1]		Five years	[1]
Option Grants Expires		September 25, 2020		May 24, 2020		May 24, 2020		May 23, 2020			May 31, 2019

[1] Options vest in equal annual installments on each grant anniversary date commencing one year following the date of grant.