Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 16,328	$ 19,580	$ 22,308
Audited statutory capital and surplus	197,375	176,009	158,376
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,190	1,451	1,391
Audited statutory capital and surplus	7,991	6,798	5,386
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	10,350	17,473	12,150
Audited statutory capital and surplus	195,931	189,279	172,282
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	8,062	8,139	9,217
Audited statutory capital and surplus	26,653	28,011	28,892
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,594	1,039	1,161
Audited statutory capital and surplus	$ 12,674	$ 12,691	$ 12,685