Policyholders' Liabilities - Guaranteed Minimum Crediting Rate (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 211,715	$ 199,786
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 36,214	$ 40,066
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149 | Minimum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	0.00%	0.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149 | Maximum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	1.49%	1.49%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 34,543	$ 26,588
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299 | Minimum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	1.50%	1.50%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299 | Maximum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	2.99%	2.99%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 109,511	$ 101,274
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449 | Minimum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.00%	3.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449 | Maximum [Member]
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.49%	4.49%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450
Policyholder Account Balance [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.50%	4.50%
Policyholder Account Balance	$ 31,447	$ 31,858
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance [Line Items]
Policyholder Account Balance	155,474	159,787
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149
Policyholder Account Balance [Line Items]
Policyholder Account Balance	792	736
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299
Policyholder Account Balance [Line Items]
Policyholder Account Balance	22,353	25,929
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449
Policyholder Account Balance [Line Items]
Policyholder Account Balance	100,882	101,264
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450
Policyholder Account Balance [Line Items]
Policyholder Account Balance	31,447	31,858
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Policyholder Account Balance	662	603
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299
Policyholder Account Balance [Line Items]
Policyholder Account Balance	531	593
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449
Policyholder Account Balance [Line Items]
Policyholder Account Balance	131	10
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Policyholder Account Balance	9,566	1,210
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,031	1,144
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299
Policyholder Account Balance [Line Items]
Policyholder Account Balance	37	66
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449
Policyholder Account Balance [Line Items]
Policyholder Account Balance	8,498	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance [Line Items]
Policyholder Account Balance	46,013	38,186
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0000 To 0149
Policyholder Account Balance [Line Items]
Policyholder Account Balance	34,391	38,186
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0150 To 0299
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11,622	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 0300 To 0449
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Greater Than Or Equal To 0450
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 0	$ 0