Fair Value Measurements (Details) - EBP 001 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 446,587,449	$ 385,063,442
KB Home Stock Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	14,494,073	18,076,332
Fair Value, Inputs, Level 1, Level 2, and Level 3
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	443,480,107	381,832,568
Level 1 \| Participant-directed brokerage account investments
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	18,561,437	12,502,903
Level 1 \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	396,314,914	338,033,293
Level 1 \| Money market fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	14,109,683	13,220,040
Level 1 \| KB Home Stock Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	14,494,073	18,076,332
NAV
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 3,107,342	$ 3,230,874

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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Name:	us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant