XML 54 R41.htm IDEA: XBRL DOCUMENT
v3.25.1

Long-Term Debt and Commitments, Long-Term Debt (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2022 USD ($) Loan | Mar. 30, 2025 USD ($) qtr | Mar. 31, 2024 USD ($) | Dec. 31, 2027 Loan | Dec. 31, 2025 Loan | Dec. 31, 2024 USD ($) | Nov. 26, 2024 USD ($) | Aug. 11, 2022 USD ($) | Jun. 30, 2020 USD ($)
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 966.7 |  |  |  |  | $ 966.1 |  |  |  |
Repayment of long-term debt |  | 0.0 |  | $ 3.6 |  |  |  |  |  |  |
Short-term debt |  | $ 19.7 | [1] |  |  |  | 5.1 | [2] |  |  |
Senior Secured Credit Facilities [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Period prior to stated maturity date of Senior Notes |  | 91 days |  |  |  |  |  |  |  |  |
Threshold amount of Senior Notes |  | $ 50.0 |  |  |  |  |  |  |  |  |
Period after scheduled maturity date of facility |  | 90 days |  |  |  |  |  |  |  |  |
Revolving Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 400.0 |  |
Maturity date |  | Nov. 26, 2029 |  |  |  |  |  |  |  |  |
Adjustment to applicable margin, Category a |  | 0.375% |  |  |  |  |  |  |  |  |
Adjustment to applicable margin, Category b |  | 0.125% |  |  |  |  |  |  |  |  |
Adjustment to applicable margin, Category c |  | (0.125%) |  |  |  |  |  |  |  |  |
Commitment fee |  | 0.175% |  |  |  |  |  |  |  |  |
Step-down commitment fee |  | 0.15% |  |  |  |  |  |  |  |  |
Fronting fee |  | 0.125% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category a |  | 3 |  |  |  |  |  |  |  |  |
Net leverage ratio, Category b |  | 2 |  |  |  |  |  |  |  |  |
Step-up commitment fee |  | 0.25% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category b |  | 3 |  |  |  |  |  |  |  |  |
Net leverage ratio, Category c |  | 1 |  |  |  |  |  |  |  |  |
Step-up commitment fee |  | 0.30% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | Term SOFR [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 1.375% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 0.375% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | EURIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 1.375% |  |  |  |  |  |  |  |  |
Revolving Facility [Member] | SONIA [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 1.375% |  |  |  |  |  |  |  |  |
Term Loan due 2031 [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 575.0 |  |
Maturity date |  | Nov. 26, 2031 |  |  |  |  |  |  |  |  |
Amortization rate of loans |  | 1.00% |  |  |  |  |  |  |  |  |
Original issue discount rate |  | 99.875% |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 568.0 |  |  |  |  | $ 567.7 |  |  |  |
Term Loan due 2031 [Member] | Term SOFR [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 2.00% |  |  |  |  |  |  |  |  |
Term Loan due 2031 [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 1.00% |  |  |  |  |  |  |  |  |
Previous Secured Credit Facilities [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of quarters to maintain net leverage ratio under financial covenant | qtr |  | 4 |  |  |  |  |  |  |  |  |
Previous Secured Credit Facilities [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio under financial covenant |  | 4 |  |  |  |  |  |  |  |  |
Net leverage ratio under financial covenant in connection with certain significant acquisitions |  | 5 |  |  |  |  |  |  |  |  |
Term Loan due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  | $ 550.0 |
Revolving Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 300.0 |
Long-term debt |  | $ 19.0 |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 9.1 |  |  |  |  |  |  |  |  |
Senior Notes due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 400.0
Maturity date |  | Jun. 30, 2028 |  |  |  |  |  |  |  |  |
Interest rate |  | 5.00% |  |  |  |  | 5.00% |  |  |  |
Guarantee amount |  | $ 50.0 |  |  |  |  |  |  |  |  |
Senior Notes due 2028 [Member] | Redemption of Notes if Company Experiences Change of Control [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 101.00% |  |  |  |  |  |  |  |  |
Japan Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 0.9 |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | 0.0 |  |  |  |  |  |  |  |  |
Austria and Slovakia Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of term loans assumed | Loan | 2 |  |  |  |  |  |  |  |  |  |
Austria and Slovakia Term Loans [Member] | Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of term loans that mature | Loan |  |  |  |  | 1 | 1 |  |  |  |  |
Austria and Slovakia Term Loans [Member] | Concept Pet [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term debt assumed as part of acquisition | $ 1.9 |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | 0.0 |  |  |  |  |  |  |  |  |
Uncommitted Short-Term Bank Credit Lines [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 18.3 |  |  |  |  |  |  |  |  |
Short-term debt |  | $ 0.7 |  |  |  |  |  |  |  |  |
[1] | Unaudited
[2] | Condensed from audited financial statements

X
- Definition Increase (decrease) in the percentage points added to the reference rate to compute the variable rate on the debt instrument in the event that, and for so long as, the net leverage ratio (as defined) is greater than or equal to 3.00 to 1.00 as of the last day of the preceding fiscal quarter. + References No definition available. + Details
Name: | mtx_AdjustmentToApplicableMarginCategory1
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (decrease) in the percentage points added to the reference rate to compute the variable rate on the debt instrument in the event that, and for so long as, the net leverage ratio (as defined) is less than 2.00 to 1.00 and greater than or equal to 1.00 to 1.00 as of the last day of the preceding fiscal quarter. + References No definition available. + Details
Name: | mtx_AdjustmentToApplicableMarginCategory2
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (decrease) in the percentage points added to the reference rate to compute the variable rate on the debt instrument in the event that, and for so long as, the net leverage ratio (as defined) is less than 1.00 to 1.00 as of the last day of the preceding fiscal quarter. + References No definition available. + Details
Name: | mtx_AdjustmentToApplicableMarginCategory3
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization rate of loans under the facility. + References No definition available. + Details
Name: | mtx_DebtInstrumentAmortizationRateOfLoans
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of fiscal quarters under a financial covenant that requires the Company, if on the last day of any fiscal quarter loans or letters of credit were outstanding under the Revolving Facility, to maintain a maximum net leverage ratio (as defined in the credit agreement). + References No definition available. + Details
Name: | mtx_DebtInstrumentFinancialCovenantNumberOfQuartersToMaintainNetLeverageRatio
Namespace Prefix: | mtx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fee, expressed as a percentage of the average daily undrawn amount of letters of credit issued under the facility, to be charged by the Fronting Lender. + References No definition available. + Details
Name: | mtx_DebtInstrumentFrontingFee
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate amount of the Company's or any of the Company's wholly owned domestic subsidiaries' long-term indebtedness unconditionally guaranteed on a senior unsecured basis under the debt instrument. + References No definition available. + Details
Name: | mtx_DebtInstrumentGuaranteeAmount
Namespace Prefix: | mtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net leverage ratio, as defined in one of the financial covenants included in the credit agreement. + References No definition available. + Details
Name: | mtx_DebtInstrumentNetLeverageRatio
Namespace Prefix: | mtx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition On any date of determination, the first ratio of (a) an amount equal to (i) Total Indebtedness as of such date, less (ii) the aggregate amount of Unrestricted Cash as of such date to (b) Consolidated EBITDA for the Test Period most recently ended on or prior to such date. + References No definition available. + Details
Name: | mtx_DebtInstrumentNetLeverageRatioCategory1
Namespace Prefix: | mtx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition On any date of determination, the second ratio of (a) an amount equal to (i) Total Indebtedness as of such date, less (ii) the aggregate amount of Unrestricted Cash as of such date to (b) Consolidated EBITDA for the Test Period most recently ended on or prior to such date. + References No definition available. + Details
Name: | mtx_DebtInstrumentNetLeverageRatioCategory2
Namespace Prefix: | mtx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition On any date of determination, the third ratio of (a) an amount equal to (i) Total Indebtedness as of such date, less (ii) the aggregate amount of Unrestricted Cash as of such date to (b) Consolidated EBITDA for the Test Period most recently ended on or prior to such date. + References No definition available. + Details
Name: | mtx_DebtInstrumentNetLeverageRatioCategory3
Namespace Prefix: | mtx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net leverage ratio, as defined in one of the financial covenants included in the credit agreement in connection with certain significant acquisitions. + References No definition available. + Details
Name: | mtx_DebtInstrumentNetLeverageRatioInConnectionWithCertainSignificantAcquisitions
Namespace Prefix: | mtx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period prior to the stated maturity date of the Company's 5.0% Senior Notes due 2028, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | mtx_DebtInstrumentPeriodPriorToStatedMaturityDateOfSeniorNotes
Namespace Prefix: | mtx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition A fee structure within a credit facility where the commitment fee (the charge for keeping a credit line open, even if not fully used) decreases over time, often based on specific milestones or as the loan matures. The borrower pays a lower fee as the loan term progresses. + References No definition available. + Details
Name: | mtx_DebtInstrumentStepDownCommitmentFee
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A fee structure within a credit facility where the commitment fee (the charge for keeping a credit line open, even if not fully used) increases over time, often based on a predetermined schedule or specific triggers in the loan agreement. The borrower pays a higher fee as the loan term progresses. + References No definition available. + Details
Name: | mtx_DebtInstrumentStepUpCommitmentFee
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period after the scheduled maturity date of the Refinancing Revolving Facility or of the Refinancing Term Loan Facility, as applicable. + References No definition available. + Details
Name: | mtx_DebtInstrumentTermAfterScheduledMaturityDateOfFacility
Namespace Prefix: | mtx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold amount of Senior Notes used in determining the adjusted maturity date of loans under the facility. + References No definition available. + Details
Name: | mtx_DebtInstrumentThresholdAmountOfSeniorNotes
Namespace Prefix: | mtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of term loans assumed by the Company as part of an acquisition. + References No definition available. + Details
Name: | mtx_NumberOfTermLoans
Namespace Prefix: | mtx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of term loans that will mature. + References No definition available. + Details
Name: | mtx_NumberOfTermLoansThatMature
Namespace Prefix: | mtx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The original issue discount (OID) rate is the difference between the price a debt instrument is issued at and its redemption price at maturity. + References No definition available. + Details
Name: | mtx_OriginalIssueDiscountRate
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-5 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtInstrumentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_ShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_RefinancingFacilityAgreementAndIncrementalFacilityAmendmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_RefinancingRevolvingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=mtx_TermSofrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=mtx_EuroInterbankOfferedRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=mtx_SterlingOvernightIndexAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_TermLoanDue2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_SeniorSecuredCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_SeniorSecuredRevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_SeniorNotesDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=mtx_RedemptionOfNotesIfCompanyExperiencesChangeOfControlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_JapanLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_AustriaAndSlovakiaTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mtx_ConceptPetHeimtierprodukteGmbhMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_UncommittedShortTermBankCreditLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |