Benefit Plans (Projected benefit obligation exceeding the fair value of plan assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2008
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 50,426	$ 48,613
Defined Benefit Plan, Accumulated Benefit Obligation			46,001
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	50,426	48,613
Defined Benefit Plan, Accumulated Benefit Obligation	$ 56,612	$ 49,206