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STATEMENTS OF CONSOLIDATED OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Tax expense (benefit) due to pension adjustment	$ 420	$ 26	$ (5,107)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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