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v3.22.1

Subsequent Events (Details) - USD ($) | Apr. 07, 2022 | Feb. 28, 2022
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April 2022 Stock Repurchase Program | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Stock Repurchase Program, Authorized Amount | $ 300,000,000 |
July 2021 Stock Repurchase Program |  |
Subsequent Event [Line Items] |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 331,400
July 2021 Stock Repurchase Program | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 331,400 |

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=kbh_April2022StockRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=kbh_July2021StockRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |