Commitments Lease Disclosures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Jan. 31, 2011 Portland, Oregon Office building	Mar. 31, 2013 Portland, Oregon Office building	Jan. 03, 2011 Portland, Oregon Office building sqft	Nov. 01, 2012 New York City Office building sqft	Apr. 02, 2012 Los Angeles Office building sqft	Apr. 02, 2011 State of Oregon Notes payable Leasehold improvements
Operating Leased Assets [Line Items]
Period of lower occupancy expenses due to lease amendment (in years)				5 years
Tenant improvement allowance						$ 0.8	$ 0.6
Landlord reimbursement for tenant improvements					0.6
Square footage occupied						58,818	12,200	83,028
Net rent expense	2.7	2.0	2.2
Face amount of loan									$ 0.5