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Subsequent events	6 Months Ended
Subsequent events	Sep. 30, 2011
Subsequent events [Abstract]
Subsequent events	17. Subsequent events We evaluated all subsequent events to ensure that we have included in this Form 10-Q appropriate disclosure of events both recognized in the financial statements as of September 30, 2011 and events which occurred subsequent to September 30, 2011 but were not recognized in the financial statements.