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Profit Sharing Plans, Contributions Made by Corporation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Pension and Other Postretirement Benefit Contributions [Abstract] |  |  |
Contributions made to the profit sharing plan | $ 0 us-gaap_PensionContributions | $ 0 us-gaap_PensionContributions | $ 0 us-gaap_PensionContributions

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

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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration