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Inventory Impairments and Land Option Contract Abandonments - Valuation Inputs (Details) | 12 Months Ended
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Nov. 30, 2020 USD ($) delivery | Nov. 30, 2019 USD ($) delivery | Nov. 30, 2018 USD ($) delivery
Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Average selling price | $ | $ 301,600 | $ 315,000 | $ 291,300
Deliveries per month | delivery | 1 | 1 | 2
Discount rate | 17.00% | 17.00% | 17.00%
Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Average selling price | $ | $ 1,127,100 | $ 1,045,400 | $ 774,100
Deliveries per month | delivery | 4 | 4 | 6
Discount rate | 18.00% | 17.00% | 19.00%

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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value estimate input, average selling price + References No definition available. + Details
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Namespace Prefix: | kbh_
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Balance Type: | credit
Period Type: | duration

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- Definition Fair value estimate input, delivery for period + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |