Concentrations of Risk - Additional Information (Detail) |
Nov. 30, 2021
USD ($)
|
|---|---|
| Concentration Risk [Line Items] | |
| Cash balances not federally insured | $ 80,000,000.0 |
| Maximum [Member] | |
| Concentration Risk [Line Items] | |
| Maximum insurance available to depositors under the FDIC's general deposit insurance rules | $ 250,000 |