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Note 7 - Postretirement and Postemployment Benefits - Assumptions (Details) - Other Postretirement Benefits Plan [Member]	12 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 24, 2017
Discount rate	2.80%	4.00%
Expected long-term return on plan assets	4.50%	4.50%
Discount rate - service cost	4.00%	3.40%	3.10%
Discount rate - interest cost	3.70%	2.80%	2.40%
Expected long-term return on plan assets	4.50%	4.50%	4.50%

X

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine benefit obligation of defined benefit plan.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average rate for present value of future retirement benefits cash flows attributed to the cost recognized for passage of time, used to determine net periodic benefit cost of defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	lee_
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Balance Type:	na
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X

- Definition

Weighted average rate for present value of future retirement benefits cash flows attributed to service rendered by employee, used to determine net periodic benefit cost of defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	lee_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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X

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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X

- Details

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