Concentrations of Risk - Additional Information (Detail)	Aug. 31, 2021 USD ($)
Concentration Risk [Line Items]
Cash balances not federally insured	$ 81,000,000.0
Maximum [Member]
Concentration Risk [Line Items]
Maximum insurance available to depositors under the FDIC's general deposit insurance rules	$ 250,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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