Income Taxes Operating loss carryforwards (Details) (USD $)	12 Months Ended
	Mar. 31, 2014
Foreign Tax Authority and State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Carryforward, Valuation Allowance	$ 20,500,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	110,600,000
Other Tax Carryforward, Valuation Allowance	51,400,000
Tax Credit Carryforward, Amount	54,300,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Carryforward, Valuation Allowance	21,800,000
Tax Credit Carryforward, Amount	21,900,000
Alternative Minimum Tax [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	308,000,000
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2015
Minimum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2015
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2034
Maximum [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2024
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 44,400,000
Research Tax Credit Carryforward [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2021
Research Tax Credit Carryforward [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Mar. 31, 2034