Note 16. Stock Compensation - Stock Compensation Awards (Details) - $ / shares	3 Months Ended
Dec. 31, 2019	Sep. 30, 2019
Annual Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Shares Awarded		34,305
Relative Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Shares Awarded		28,080
Stock Compensation, Grant Date Fair Value		$ 21.25
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Shares Awarded	2,500	188,588
Stock Compensation, Grant Date Fair Value	$ 20.46
Unrestricted Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Shares Awarded	6,321	9,091
Stock Compensation, Grant Date Fair Value	$ 19.18	$ 17.19
Minimum \| Annual Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Grant Date Fair Value		16.85
Minimum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Grant Date Fair Value		16.85
Maximum \| Annual Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Grant Date Fair Value		16.93
Maximum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Stock Compensation, Grant Date Fair Value		$ 17.24

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=kbal_AnnualPerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=kbal_RelativeTotalShareholderReturnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=kbal_UnrestrictedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: