Income Taxes Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Loss Carryforwards [Line Items]
Income tax benefit	$ 2.1
Deferred tax liabilities	2.2	0.8
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	59.5	36.5
Expected future benefit from operating loss carryforwards that will be recorded in the Consolidated Statement of Operations	27.5
Federal | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax research credit carryforwards	2.6	2.0
Expected future benefit from tax research credit carryforwards that will be recorded in the Consolidated Statement of Operations	2.0	1.3
State and Local
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	159.3	104.8
Expected future benefit from operating loss carryforwards that will be recorded in the Consolidated Statement of Operations	1.8
State and Local | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax research credit carryforwards	0.4	0.4
Expected future benefit from tax research credit carryforwards that will be recorded in the Consolidated Statement of Operations	0.2	0.2
State and Local | Other Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax research credit carryforwards	4.2	3.7
State and Local | State of Oregon
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	64.5
State and Local | Multnomah County, Oregon
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	42.6
State and Local | Portland, Oregon
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	42.6
State and Local | Outside of Oregon State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	9.6
Non-United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.8	2.4
Operating loss carryforwards, valuation allowance	$ 0.8	$ 2.3