XML 122 R102.htm IDEA: XBRL DOCUMENT v3.4.0.3

Derivative Instruments - Terms of Interest Rate Swaps Underlying Swaption (Parenthetical) (Detail) - USD ($)	Jul. 31, 2026	Jan. 31, 2026	Oct. 31, 2024	Jul. 31, 2018	Jan. 31, 2018	Apr. 30, 2017
Interest rate swaption agreements [Member] | Scenario Forecast [Member]
Derivative [Line Items]
Principal amount	$ 82,500,000	$ 82,500,000	$ 85,400,000	$ 160,000,000	$ 160,000,000	$ 155,000,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwaptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: