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Variable Interest Entities (Details) - USD ($) $ in Thousands	Nov. 30, 2015	Nov. 30, 2014
Variable Interest Entity [Line Items]
Cash Deposits	$ 54,537	$ 33,059
Aggregate Purchase Price	1,187,707	958,470
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts	65,600	48,000
Outstanding letters of credit	0	100
Increase in inventories and accrued expenses and other liabilities	110,000	3,100
Unconsolidated VIEs [Member]
Variable Interest Entity [Line Items]
Cash Deposits	32,436	10,633
Aggregate Purchase Price	611,567	520,628
Other land option contracts and other similar contracts [Member]
Variable Interest Entity [Line Items]
Cash Deposits	22,101	22,426
Aggregate Purchase Price	$ 576,140	$ 437,842

X

- Definition

Acquisition costs related to land option contracts and other similar contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregate purchase price associated with land option and other similar contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Cash deposits on land option and other similar contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	kbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Increase in inventories and accrued expenses and other liabilities due to land option and other similar contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Outstanding letters of credit in lieu of cash deposits under certain land option or other similar contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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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

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- Details

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- Details

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