Carrying Value of Surplus Real Estate (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Real Estate Companies Disclosures [Abstract]
Carrying value of surplus real estate	$ 14.3	$ 14.8

Amount of investment in certain other real estate investments not specifically identified elsewhere in the existing taxonomy.

No definition available.

Name:	us-gaap_InventoryRealEstateOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant