Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Jun. 06, 2013 Wage and Hour Putative Class Action Lawsuit [Member] Pending Litigation [Member] Subsequent Event [Member]
Commitments and Contingencies Disclosure [Abstract]
Operating leases, renewal option period (for periods up to 10 years)	10 years
Operating leases, future minimum payments due, future minimum sublease rentals	$ 100,000
Operating leases, rental expense	3,300,000	4,100,000	5,300,000
Asset retirement obligation, current	30,000	200,000
Asset retirement obligation, noncurrent	700,000	500,000
Loss Contingencies [Line Items]
Loss contingency, proposed settlement amount				$ 1,500,000