Long Term Debt (narrative) (detail) (USD $)	12 Months Ended
Mar. 31, 2013
Debt Instrument [Line Items]
Other Restrictions on Payment of Dividends	$ 50,000
Cash dividends paid on preferred stock	23,000
Pledged Assets Not Separately Reported Fixed Assets	688,358,000
Secured By Direct Pay Letter Of Credit [Member]
Debt Instrument [Line Items]
Special Assessment Bond, Noncurrent	22,630,000
Wayne County [Member]
Debt Instrument [Line Items]
Special Assessment Bond, Noncurrent	$ 5,060,000

Equity impact of preferred stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.

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The noncurrent portion of the carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project.

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