Shareholders' Equity (Schedule of Other than Options) (Details) - $ / shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022
Restricted Stock
Shares
Unvested shares, beginning balance (in shares)	10,287
Granted (in shares)	31,756
Vested (in shares)	(20,046)
Unvested shares, ending balance (in shares)	21,997	10,287
Weighted Average Fair Value at Grant Date
Beginning balance (in dollars per share)	$ 131.27
Granted (in dollars per share)	134.71	$ 131.27	$ 144.73
Vested (in dollars per share)	134.37
Ending balance (in dollars per share)	$ 133.41	$ 131.27
Weighted Average Remaining Contractual Term (years)	10 months 24 days	4 months 24 days
Restricted Stock \| Employees Of Altra
Shares
Granted (in shares)	20,265
Weighted Average Fair Value at Grant Date
Granted (in dollars per share)	$ 138.31
Restricted Stock Units (RSUs)
Shares
Unvested shares, beginning balance (in shares)	156,413
Granted (in shares)	261,706
Vested (in shares)	(113,337)
Forfeited (in shares)	(41,186)
Unvested shares, ending balance (in shares)	263,596	156,413
Weighted Average Fair Value at Grant Date
Beginning balance (in dollars per share)	$ 136.95
Granted (in dollars per share)	141.89	$ 147.70	143.44
Vested (in dollars per share)	131.29
Forfeited (in dollars per share)	142.46
Ending balance (in dollars per share)	$ 143.43	$ 136.95
Weighted Average Remaining Contractual Term (years)	1 year 10 months 24 days	1 year 10 months 24 days
Restricted Stock Units (RSUs) \| Employees Of Altra
Shares
Granted (in shares)	161,414
Weighted Average Fair Value at Grant Date
Granted (in dollars per share)	$ 135.50
Performance Share Units
Shares
Unvested shares, beginning balance (in shares)	107,665
Granted (in shares)	59,101
Vested (in shares)	(36,476)
Forfeited (in shares)	(4,388)
Unvested shares, ending balance (in shares)	125,902	107,665
Weighted Average Fair Value at Grant Date
Beginning balance (in dollars per share)	$ 131.07
Granted (in dollars per share)	235.77	$ 151.27	$ 120.19
Vested (in dollars per share)	63.20
Forfeited (in dollars per share)	203.28
Ending balance (in dollars per share)	$ 197.36	$ 131.07
Weighted Average Remaining Contractual Term (years)	1 year 10 months 24 days	1 year 9 months 18 days

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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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).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (e)(1)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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