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Note O - Pension and Other Postretirement Benefit Plans - Schedule of Assumptions (Details) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Pension Plan [Member] |  |
Discount rate | 3.22% | 4.01%
Expected return on plan assets | 6.04% | 6.74%
Discount rate | 4.01% | 3.51%
Expected return on plan assets | 6.74% | 6.68%
Other Postretirement Benefits Plan [Member] |  |
Discount rate | 3.15% | 4.09%
Expected return on plan assets |  |
Discount rate | 4.09% | 3.41%
Expected return on plan assets |  |

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- Definition The rate of return expected on plan assets to determine benefit obligations. + References No definition available. + Details
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Namespace Prefix: | twin_
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Period Type: | instant

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- 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 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- 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 + Details
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- Details
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- Details
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Namespace Prefix: |
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