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Loss Contingencies (Narratives) (Details) (USD $)	6 Months Ended
Loss Contingencies (Narratives) (Details) (USD $)	Sep. 30, 2012 month
Loss Contingencies [Line Items]
Asbestos-related aggregate liability - Minimum	$ 7,000,000
Asbestos-related aggregate liability - Maximum	18,000,000
Loss Contingency, Estimate of Possible Loss	11,400,000
Asbestos liability payments	1,500,000
Loss Settlement Gross Period	12
Estimated Litigation Liability, Noncurrent	$ 7,300,000
Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency Period	30
Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency Period	18

Carrying amount of estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid after one year or beyond the normal operating cycle, if longer.

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- Definition

The estimated maximum amount of possible loss from the contingency.

+ References+ Details

- Definition

The estimated minimum amount of possible loss from the contingency.

+ References+ Details