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Carrying Value of Surplus Real Estate (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Real Estate Companies Disclosures [Abstract] |  |
Carrying value of surplus real estate | $ 14.1 us-gaap_InventoryRealEstateOther | $ 14.1 us-gaap_InventoryRealEstateOther

X
- Definition Amount of investment in certain other real estate investments not specifically identified elsewhere in the existing taxonomy. + References No definition available. + Details
Name: | us-gaap_InventoryRealEstateOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RealEstateCompaniesDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration