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Earnings Per Share - Additional Information (Detail) (Employee stock option and SARs plans) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
Employee stock option and SARs plans
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities not included in the calculation of diluted earnings per share (in shares)	0.4

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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