Line of Credit (Details) - USD ($)	3 Months Ended	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016	Jan. 04, 2016
Line of Credit Facility [Line Items]
Loans outstanding	$ 48,000,000	$ 48,000,000		$ 105,000,000
Remaining borrowing capacity	202,000,000	202,000,000
Interest expense	532,000	1,272,000
Amortization of debt issuance costs	$ (269,000)	$ (538,000)	$ 0
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 250,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					10,000
Swing-Line Loans [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 10,000