XML 56 R43.htm IDEA: XBRL DOCUMENT
v3.24.2

Long-Term Debt and Commitments, Long-Term Debt (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2022 USD ($) Loan | Jun. 30, 2024 USD ($) qtr | Jul. 02, 2023 USD ($) | Dec. 31, 2027 Loan | Dec. 31, 2025 Loan | Dec. 31, 2023 USD ($) | Aug. 11, 2022 USD ($) | Jun. 30, 2020 USD ($) | Apr. 18, 2018 USD ($) | Feb. 14, 2017 USD ($)
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 922.4 |  |  |  |  | $ 929.1 |  |  |  |  |
Repayment of long-term debt |  | 7.2 |  | $ 7.4 |  |  |  |  |  |  |  |
Short-term debt |  | $ 69.0 | [1] |  |  |  | 85.4 | [2] |  |  |  |
Senior Secured Credit Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of quarters to maintain net leverage ratio under financial covenant | qtr |  | 4 |  |  |  |  |  |  |  |  |  |
Senior Secured Credit Facilities [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 3 |  |  |  |  |  |  |  |  |  |
Senior 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 |  |  |
Adjustment to applicable margin, Category a |  | 0.25% |  |  |  |  |  |  |  |  |  |
Adjustment to applicable margin, Category b |  | (0.125%) |  |  |  |  |  |  |  |  |  |
Adjustment to applicable margin, Category c |  | (0.25%) |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 523.8 |  |  |  |  | $ 530.4 |  |  |  |  |
Term Loan due 2027 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category a |  | 3 |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category b |  | 1 |  |  |  |  |  |  |  |  |  |
Term Loan due 2027 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category b |  | 2 |  |  |  |  |  |  |  |  |  |
Net leverage ratio, Category c |  | 1 |  |  |  |  |  |  |  |  |  |
Term Loan due 2027 [Member] | SOFR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Credit spread adjustment |  | 0.10% |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 1.50% |  |  |  |  |  |  |  |  |  |
Term Loan due 2027 [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin |  | 0.50% |  |  |  |  |  |  |  |  |  |
Revolving Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 300.0 |  |  |
Commitment fee |  | 0.25% |  |  |  |  |  |  |  |  |  |
Commitment fee, Category a |  | 0.30% |  |  |  |  |  |  |  |  |  |
Commitment fee, Category b |  | 0.175% |  |  |  |  |  |  |  |  |  |
Commitment fee, Category c |  | 0.15% |  |  |  |  |  |  |  |  |  |
Fronting fee |  | 0.125% |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 69.0 |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 9.1 |  |  |  |  |  |  |  |  |  |
Term Loan due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  | $ 788.0
Revolving Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 300.0 |
Senior Notes due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  | $ 400.0 |  |
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 |  | $ 1.1 |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | 0.1 |  |  |  |  |  |  |  |  |  |
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 |  | 0.1 |  |  |  |  |  |  |  |  |  |
Uncommitted Short-Term Bank Credit Lines [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Commitments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 25.2 |  |  |  |  |  |  |  |  |  |
Short-term debt |  | $ 0.0 |  |  |  |  |  |  |  |  |  |
[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 Adjustment between LIBOR and Risk Free Rate to reduce or eliminate the economic value transfer between the lender and the borrower when the index changes from LIBOR to the replacement Risk Free Rate. + References No definition available. + Details
Name: | mtx_DebtInstrumentCreditSpreadAdjustment
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 As of any date of determination, the ratio of (a) Consolidated EBITDA for the four consecutive fiscal quarters (Test Period) most recently ended on or prior to such date to (b) Consolidated Interest Expense of the Company and its Subsidiaries for such Test Period. + References No definition available. + Details
Name: | mtx_DebtInstrumentInterestCoverageRatio
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. + 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 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 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_LineOfCreditFacilityCommitmentFeePercentageCategory1
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 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_LineOfCreditFacilityCommitmentFeePercentageCategory2
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 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_LineOfCreditFacilityCommitmentFeePercentageCategory3
Namespace Prefix: | mtx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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 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 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_SeniorSecuredCreditFacilitiesMember
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_DebtInstrumentAxis=mtx_TermLoanFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mtx_RevolvingFacilityMember
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: |