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Retirement Plans (Schedule of Assumptions Used) (detail)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Assumbptions Used [Abstract]
Discount rate - benefit obligation	4.70%	5.10%
Discount rate - pension expense	5.10%	5.85%
Expected return on plan assets	7.50%	8.00%
Rate of compensation increase	3.00%	3.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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