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Employee Benefit Plans (Details 7) | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Summary of weighted average asset allocation of the plan assets by asset category |  |
Target Plan Asset Allocations | 100.00% | 100.00%
Equity Securities [Member] |  |
Summary of weighted average asset allocation of the plan assets by asset category |  |
Target Plan Asset Allocations Range Minimum | 50.00% |
Target Plan Asset Allocations Range Maximum | 70.00% |
Target Plan Asset Allocations | 68.00% | 67.00%
Debt Securities [Member] |  |
Summary of weighted average asset allocation of the plan assets by asset category |  |
Target Plan Asset Allocations Range Minimum | 20.00% |
Target Plan Asset Allocations Range Maximum | 50.00% |
Target Plan Asset Allocations | 32.00% | 33.00%
Other, including cash [Member] |  |
Summary of weighted average asset allocation of the plan assets by asset category |  |
Target Plan Asset Allocations Range Minimum | 0.00% |
Target Plan Asset Allocations Range Maximum | 10.00% |
Target Plan Asset Allocations |  |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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