Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 23,960	$ 16,328	$ 19,580
Audited statutory capital and surplus	216,763	197,375	176,009
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,612	1,190	1,451
Audited statutory capital and surplus	9,390	7,991	6,798
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	11,367	10,350	17,473
Audited statutory capital and surplus	203,723	195,931	189,279
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	8,735	8,062	8,139
Audited statutory capital and surplus	27,232	26,653	28,011
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,436	1,594	1,039
Audited statutory capital and surplus	$ 12,817	$ 12,674	$ 12,691