Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Mar. 31, 2021 USD ($) branch segments	Mar. 31, 2020 USD ($) branch	Mar. 31, 2019 USD ($) branch
Business Segments [Abstract]
Number of reportable segments | segments	1
Cash and Cash Equivalents [Abstract]
Restricted cash	$ 7,000,000.0	$ 5,400,000
Loans and Interest Income [Abstract]
Gross loans receivable	1,104,746,261	1,209,871,366
Impaired loans [Abstract]
Bankrupt accounts that had not been charged off	3,200,000
Maximum
Loans and Interest Income [Abstract]
Originations	3,500	3,500	$ 3,500
Small loans
Loans and Interest Income [Abstract]
Gross loans receivable	620,959,979	761,364,753
Small loans | Minimum
Loans and Interest Income [Abstract]
Originations	$ 250
Loan term	4 months
Small loans | Maximum
Loans and Interest Income [Abstract]
Originations	$ 2,450
Loan term	30 months
Large loans
Loans and Interest Income [Abstract]
Gross loans receivable	$ 475,470,271	442,683,915
Large loans | Minimum
Loans and Interest Income [Abstract]
Originations	$ 2,500
Loan term	12 months
Large loans | Maximum
Loans and Interest Income [Abstract]
Originations	$ 21,400
Loan term	48 months
Sales finance loans
Loans and Interest Income [Abstract]
Gross loans receivable	$ 8,316,011	$ 5,822,698
Sales finance loans | Minimum
Loans and Interest Income [Abstract]
Originations	$ 100
Loan term	8 months
Sales finance loans | Maximum
Loans and Interest Income [Abstract]
Originations	$ 5,000
Loan term	8 months
United States
Schedule of Subsidiaries Information [Line Items]
Number of offices operated in the United States of America | branch	1,205
Mexico
Schedule of Subsidiaries Information [Line Items]
Number of offices operated in the United States of America | branch		0	0