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v3.23.1

Subsequent Event (Details) - USD ($) $ in Millions | Mar. 21, 2023 | Mar. 20, 2023 | Feb. 28, 2023 | Nov. 30, 2022 | Apr. 07, 2022
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April 2022 Stock Repurchase Program |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 75.0 | $ 150.0 | $ 300.0
Subsequent Event | March 2023 Stock Repurchase Program |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 500.0 |  |  |  |
Subsequent Event | April 2022 Stock Repurchase Program |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 75.0 |  |  |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- 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_March2023StockRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |