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ESOP Compensation Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Length of service requirement | 1 year 0 months 0 days | 1 year 0 months 0 days | 1 year 0 months 0 days
Employee stock ownership plan (ESOP), compensation expense | $ 6.9 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 6.6 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 5.0 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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