Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Shares - Antidilutive securities (Details)	12 Months Ended
Shares - Antidilutive securities (Details)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive awards not considered in computing diluted earnings per share	2,985,722	1,834,794	1,647,474
Stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive awards not considered in computing diluted earnings per share		50,000	75,591
Deferred performance share units (DPSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive awards not considered in computing diluted earnings per share			150,000