XML 93 R79.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Schedule of Minimum and Maximum Market Value of Plan Assets (Detail) | 12 Months Ended
--- | ---
Mar. 31, 2016
Equity Securities |
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items] |
Minimum market value objective for plan assets | 55.00%
Maximum market value objective for plan assets | 75.00%
Debt Securities |
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items] |
Minimum market value objective for plan assets | 25.00%
Maximum market value objective for plan assets | 45.00%
Investment Grade Bonds |
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items] |
Minimum market value objective for plan assets | 0.00%
Maximum market value objective for plan assets | 20.00%
Cash and Cash Equivalents |
Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items] |
Minimum market value objective for plan assets | 0.00%
Maximum market value objective for plan assets | 10.00%

X
- Definition Schedule of Pension and Other Postretirement Plan Assets by Fair Value [Line Items] + References No definition available. + Details
Name: | tdw_ScheduleOfPensionAndOtherPostretirementPlanAssetsByFairValueLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=tdw_InvestmentGradeBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |