Summary of Business and Significant Accounting Policies - Narrative (Detail) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Business And Significant Accounting Policies [Line Items] | ||
| Majority owned percentage in HCFI subsidiary (percent) | 52.33% | 52.33% |
| Dealer | ||
| Business And Significant Accounting Policies [Line Items] | ||
| Dealer loans threshold days past due for recognition of finance revenue to be discontinued | 90 days | |
| Retail | ||
| Business And Significant Accounting Policies [Line Items] | ||
| Retail loans and leases threshold days past due for automatic charge off | 120 days | |
| Minimum | ||
| Business And Significant Accounting Policies [Line Items] | ||
| Retail loan term | 2 years | |
| Lease term | 2 years | |
| Maximum | ||
| Business And Significant Accounting Policies [Line Items] | ||
| Retail loan term | 7 years | |
| Lease term | 5 years |