XML 68 R52.htm IDEA: XBRL DOCUMENT
v3.19.3

Accumulated Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 563,260 |
Total other comprehensive loss, net | $ (5,563) | $ (5,395) | (1,444) | $ (12,848)
Balance at end of period | 624,596 |  | 624,596 |
Cumulative Translation Adjustment [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (54,257) | (38,163)
Other comprehensive (loss) income before reclassifications |  |  | (2,199) | (5,143)
Amounts reclassified from AOCI |  |  | 0 | 0
Total other comprehensive loss, net |  |  | (2,199) | (5,143)
Reclassification of stranded effects of the Act |  |  |  | 0
Balance at end of period | (56,456) | (43,306) | (56,456) | (43,306)
Unrealized (Loss) Gain on Derivatives [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (214) | 847
Other comprehensive (loss) income before reclassifications |  |  | 763 | (441)
Amounts reclassified from AOCI |  |  | (630) | (455)
Total other comprehensive loss, net |  |  | 133 | (896)
Reclassification of stranded effects of the Act |  |  |  | 112
Balance at end of period | (81) | 63 | (81) | 63
Pension/OPEB Liability Adjustment [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (24,967) | (20,610)
Other comprehensive (loss) income before reclassifications |  |  | 587 | 551
Amounts reclassified from AOCI |  |  | 620 | 218
Total other comprehensive loss, net |  |  | 1,207 | 769
Reclassification of stranded effects of the Act |  |  |  | (1,018)
Balance at end of period | (23,760) | (20,859) | (23,760) | (20,859)
Attributable to Unconsolidated Affiliates [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (354) | 6,870
Other comprehensive (loss) income before reclassifications |  |  | 828 | (7,187)
Amounts reclassified from AOCI |  |  | 0 | 0
Total other comprehensive loss, net |  |  | 828 | (7,187)
Reclassification of stranded effects of the Act |  |  |  | 1,462
Balance at end of period | 474 | 1,145 | 474 | 1,145
Total [Member] |  |  |  |
Changes in accumulated other comprehensive income [Roll Forward] |  |  |  |
Balance at beginning of period | (74,754) | (58,101) | (79,792) | (51,056)
Other comprehensive (loss) income before reclassifications |  |  | (21) | (12,220)
Amounts reclassified from AOCI |  |  | (10) | (237)
Total other comprehensive loss, net | (5,069) | (4,856) | (31) | (12,457)
Reclassification of stranded effects of the Act |  |  |  | 556
Balance at end of period | $ (79,823) | $ (62,957) | $ (79,823) | $ (62,957)

X
- Definition Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings + References No definition available. + Details
Name: | mli_TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarnings
Namespace Prefix: | mli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AOCIAttributableToParentNetOfTaxRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
Name: | us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=mli_AccumulatedOtherComprehensiveIncomeAttributabletoUnconsolidatedAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |