Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 19,580	$ 22,308	$ 21,287
Audited statutory capital and surplus	176,009	158,376	155,835
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,451	1,391	1,358
Audited statutory capital and surplus	6,798	5,386	4,175
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	17,473	12,150	12,115
Audited statutory capital and surplus	189,279	172,282	158,512
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	8,139	9,217	9,157
Audited statutory capital and surplus	28,011	28,892	28,551
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,039	1,161	886
Audited statutory capital and surplus	$ 12,691	$ 12,685	$ 11,589