XML 50 R42.htm IDEA: XBRL DOCUMENT v3.10.0.1

EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Schedule of Carrying Value of Trust Assets and Obligations Under Supplemental Plan

The following table summarizes the carrying value of the trust assets and obligations under the supplemental plan:

		Successor				Predecessor
(In thousands)		December 31, 2017				March 31, 2017
Investments held in Rabbi Trust		$	8,908				8,759
Obligations under the supplemental plan			32,508				29,108

Schedule of Unrealized (Loss) Gains in Carrying Value of Trust Assets

The following table summarizes the unrealized (loss) gains in carrying value of the trust assets:

		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Unrealized gain (loss) in carrying value of trust assets		$	256				82				(95	)
Unrealized loss in carrying value of trust assets are net of income tax expense of			—				—				(223	)

Minimum and Maximum Rate of Return Plan Assets

The below table summarizes the supplemental plan’s minimum and maximum rate of return objectives for plan assets:

		Minimum Expected Rate of Return on Plan Assets				Maximum Expected Rate of Return on Plan Assets
Equity securities			5	%			7	%
Debt securities			1	%			3	%
Cash and cash equivalents			0	%			1	%

Schedule of Minimum and Maximum Market Value of Plan Assets

The below table summarizes the supplemental plan’s minimum and maximum market value objectives for plan assets, which are based upon a five to ten year investment horizon:

		Minimum Market Value Objective for Plan Assets				Maximum Market Value Objective for Plan Assets
Equity securities			55	%			75	%
Debt securities			25	%			45	%
Percentage of debt securities allowed in below investment grade bonds			0	%			20	%
Cash and cash equivalents			0	%			10	%

Schedule of Asset Allocations

The following table provides the target and actual asset allocations for the pension plan and the supplemental plan:

						Successor				Predecessor
		Target				Actual as of December 31, 2017				Actual as of March 31, 2017
U.S. Pension plan:
Equity securities			—				—				—
Debt securities			100	%			98	%			98	%
Cash and other			—				2	%			2	%
Total			100	%			100	%			100	%
Supplemental plan:
Equity securities			65	%			59	%			59	%
Debt securities			35	%			38	%			37	%
Cash and other			—				3	%			4	%
Total			100	%			100	%			100	%

Fair Value Hierarchy of Plan Assets

The fair value hierarchy for the pension plans and supplemental plan assets measured at fair value as of December 31, 2017 (Successor), are as follows:

(In thousands)		Fair Value				Quoted prices in active markets (Level 1)				Significant observable inputs (Level 2)				Significant unobservable inputs (Level 3)				Measured at Net Asset Value
Pension plan measured at fair value:
Debt securities:
Government securities		$	4,238				4,238				—				—				—
Collateralized mortgage securities			1,032				—				1,032				—				—
Corporate debt securities			49,420				—				49,420				—				—
Cash and cash equivalents			834				219				615				—				—
Other			1,404				172				1,232				—				—
Total		$	56,928				4,629				52,299				—				—
Accrued income			608				608				—				—				—
Total fair value of plan assets		$	57,536				5,237				52,299				—				—
Supplemental plan measured at fair value:
Equity securities:
Common stock		$	3,599				3,599				—				—				—
Foreign stock			183				183				—				—				—
American depository receipts			1,429				1,429				—				—				—
Preferred American depository receipts			12				12				—				—				—
Real estate investment trusts			72				72				—				—				—
Debt securities:
Government debt securities			1,692				851				841				—				—
Open ended mutual funds			1,676				—				—				—				1,676
Cash and cash equivalents			246				27				170				—				49
Total		$	8,909				6,173				1,011				—				1,725
Other pending transactions			(1	)			(1	)			—				—				—
Total fair value of plan assets		$	8,908				6,172				1,011				—				1,725

The following table provides the fair value hierarchy for the pension plans and supplemental plan assets measured at fair value as of March 31, 2017 (Predecessor):

(In thousands)		Fair Value				Quoted prices in active markets (Level 1)				Significant observable inputs (Level 2)				Significant unobservable inputs (Level 3)				Measured at Net Asset Value
Pension plan measured at fair value:
Debt securities:
Government securities		$	3,770				3,770				—				—				—
Collateralized mortgage securities			2,537				—				2,537				—				—
Corporate debt securities			47,871				—				47,871				—				—
Cash and cash equivalents			989				345				644				—				—
Other			1,298				100				1,198				—				—
Total		$	56,465				4,215				52,250				—				—
Accrued income			681				681				—				—				—
Total fair value of plan assets		$	57,146				4,896				52,250				—				—
Supplemental plan measured at fair value:
Equity securities:
Common stock		$	3,561				3,561				—				—				—
Foreign stock			132				132				—				—				—
American depository receipts			1,387				1,387				—				—				—
Preferred American depository receipts			20				20				—				—				—
Real estate investment trusts			76				76				—				—				—
Debt securities:
Government debt securities			1,613				832				781				—				—
Open ended mutual funds			1,648				—				—				—				1,648
Cash and cash equivalents			323				15				236				—				72
Total		$	8,760				6,023				1,017				—				1,720
Other pending transactions			—				—				—				—				—
Total fair value of plan assets		$	8,760				6,023				1,017				—				1,720

Change in Plan Assets and Obligations

Changes in plan assets and obligations and the funded status of the U.S. defined benefit pension plan, Norway’s defined benefit pension plan, and the supplemental plan (referred to collectively as “Pension Benefits”) and the postretirement health care and life insurance plan (referred to as “Other Benefits”), are as follows:

		Pension Benefits
		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Change in benefit obligation:
Benefit obligation at beginning of the period		$	101,490				97,941				95,830
Service cost			546				393				1,182
Interest cost			1,599				1,313				3,814
Plan curtailment			(432	)			—
Benefits paid			(2,059	)			(1,610	)			(4,895	)
Actuarial (gain) loss			2,322				3,322				2,082
Foreign currency exchange rate changes			(23	)			131				(72	)
Benefit obligation at end of the period			103,443				101,490				97,941
Change in plan assets:
Fair value of plan assets at beginning of the period		$	58,148				57,146				57,174
Actual return			1,182				2,138				577
Expected return			32				16				51
Actuarial loss			(217	)			(109	)			(148	)
Administrative expenses			(15	)			(7	)			(27	)
Plan curtailment			(100	)			—				—
Employer contributions			625				435				4,465
Benefits paid			(2,059	)			(1,610	)			(4,895	)
Foreign currency exchange rate changes			(60	)			139				(51	)
Fair value of plan assets at end of the period			57,536				58,148				57,146
Payroll tax unrecognized in benefit obligation at end of the period			76				91				83
Unfunded status at end of the period		$	(45,983	)			(43,433	)			(40,878	)
Net amount recognized in the balance sheet consists of:
Current liabilities		$	(10,731	)			(1,791	)			(1,791	)
Noncurrent liabilities			(35,252	)			(41,642	)			(39,087	)
Net amount recognized		$	(45,983	)			(43,433	)			(40,878	)

		Other Benefits
		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Change in benefit obligation:
Benefit obligation at beginning of the period		$	4,817				4,811				5,573
Service cost			29				23				81
Interest cost			75				64				201
Participant contributions			65				58				411
Plan amendment			(1,861	)			—				—
Benefits paid			(526	)			(346	)			(1,170	)
Actuarial (gain) loss			325				207				(285	)
Benefit obligation at end of the period			2,924				4,817				4,811
Change in plan assets:
Fair value of plan assets at beginning of the period		$	—				—				—
Employer contributions			461				288				759
Participant contributions			65				58				411
Benefits paid			(526	)			(346	)			(1,170	)
Fair value of plan assets at end of the period			—				—				—
Unfunded status at end of the period		$	(2,924	)			(4,817	)			(4,811	)
Net amount recognized in the balance sheet consists of:
Current liabilities		$	(282	)			(418	)			(418	)
Noncurrent liabilities			(2,642	)			(4,399	)			(4,393	)
Net amount recognized		$	(2,924	)			(4,817	)			(4,811	)

Schedule of Projected and Accumulated Benefit Obligation

The following table provides the projected benefit obligation and accumulated benefit obligation for the pension plans:

		Successor				Predecessor
(In thousands)		December 31, 2017				March 31, 2017
Projected benefit obligation		$	103,443				97,941
Accumulated benefit obligation			101,287				94,467

Schedule of Accumulated Benefit Obligation in Excess of Plan Assets

The following table provides information for pension plans with an accumulated benefit obligation in excess of plan assets (includes both the pension plans and supplemental plan):

		Successor				Predecessor
(In thousands)		December 31, 2017				March 31, 2017
Projected benefit obligation		$	103,443				97,941
Accumulated benefit obligation			101,287				94,467
Fair value of plan assets			57,536				57,146

Schedule of Net Periodic Benefit Cost

The net periodic benefit cost for the company’s defined benefit pension plans and supplemental plan (referred to collectively as “Pension Benefits”) and the postretirement health care and life insurance plan (referred to collectively as “Other Benefits”) is comprised of the following components:

		Successor								Predecessor				Successor								Predecessor
(In thousands)		Quarter Ended June 30, 2018								Quarter Ended June 30, 2017				Six Months Ended June 30, 2018								Six Months Ended June 30, 2017
Pension Benefits:
Service cost		$	41								294				71								713
Interest cost			882								984				1,784								1,975
Expected return on plan assets			(482	)							(518	)			(964	)							(1,119	)
Administrative expenses			2								2				3								24
Payroll tax of net pension costs			—								—				—								56
Amortization of net actuarial losses			—								—				—								32
Recognized actuarial loss			—								561				—								1,008
Settlement loss recognized			335								—				335								—
Net periodic pension cost		$	778								1,323				1,229								2,689
Other Benefits:
Service cost		$	15								17				30								38
Interest cost			29								48				58								99
Amortization of prior service cost			(75	)							(695	)			(150	)							(1,783	)
Recognized actuarial benefit			11								(252	)			22								(535	)
Net periodic postretirement benefit		$	(20	)							(882	)			(40	)							(2,181	)

Net periodic benefit cost for the pension plans and the supplemental plan include the following components:

		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Service cost		$	546				393				1,182
Interest cost			1,599				1,313				3,814
Expected return on plan assets			(882	)			(691	)			(2,246	)
Administrational expenses			19				3				28
Payroll tax of net pension costs			29				—				56
Amortization of net actuarial losses			131				—				32
Recognized actuarial loss			—				748				1,785
Curtailment gain			(99	)			—				—
Net periodic pension cost		$	1,343				1,766				4,651

Schedule of Net Periodic Benefit Cost for Postretirement Health Care and Life Insurance Plan

Net periodic benefit cost for the postretirement health care and life insurance plan include the following components:

		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Service cost		$	29				23				81
Interest cost			75				64				201
Amortization of prior service cost			—				(927	)			(4,346	)
Recognized actuarial (gain)			—				(335	)			(1,138	)
Net periodic postretirement benefit		$	104				(1,175	)			(5,202	)

Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in OCI

Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss include the following components:

		Pension Benefits
		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Net (gain) loss		$	1,939				1,877				3,821
Fresh-start accounting fair value adjustment			—				(22,333	)			—
Amortization of net (loss) gain			—				(748	)			(1,785	)
Total recognized in other comprehensive (income) loss, before tax		$	1,939				(21,204	)			2,036
Net of tax			1,939				(21,204	)			1,323

		Other Benefits
		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Net (gain) loss		$	325				207				(285	)
Prior service (cost) credit			(1,861	)			—				—
Amortization of prior service (cost) credit			—				927				4,346
Fresh-start accounting fair value adjustment			—				19,055				—
Amortization of net (loss) gain			—				335				1,138
Total recognized in other comprehensive (income) loss, before tax		$	(1,536	)			20,524				5,199
Net of tax			(1,536	)			20,524				3,379

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss)

Amounts recognized as a component of accumulated other comprehensive income (loss) are as follows:

		Pension Benefits
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017
Unrecognized actuarial (loss) gain		$	(1,939	)			—
Pre-tax amount included in accumulated other comprehensive (loss) income		$	(1,939	)			—

		Other Benefits
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017
Unrecognized actuarial (loss) gain		$	(325	)			—
Unrecognized prior service credit (cost)			1,861				—
Pre-tax amount included in accumulated other comprehensive (loss) income		$	1,536				—

Schedule of Expected Amounts Net Periodic Benefit Costs

The company expects to recognize the following amounts as a component of net periodic benefit costs during the next fiscal year:

(In thousands)		Pension Benefits				Other Benefits
Unrecognized actuarial (loss) gain		$	—				299
Unrecognized prior service credit (cost)			—				(5	)

Schedule of Assumptions

Assumptions used to determine net benefit obligations are as follows:

		Pension Benefits								Other Benefits
		Successor				Predecessor				Successor				Predecessor
		December 31, 2017				March 31, 2017				December 31, 2017				March 31, 2017
Discount rate			3.80	%			4.25	%			3.80	%			4.25	%
Rates of annual increase in compensation levels			N/A				3.00	%			N/A				N/A

Assumptions used to determine net periodic benefit costs are as follows:

		Pension Benefits								Other Benefits
		Successor				Predecessor				Successor				Predecessor
		December 31, 2017				March 31, 2017				December 31, 2017				March 31, 2017
Discount rate			3.90	%			4.15	%			3.90	%			4.00	%
Expected long-term rate of return on assets			3.70	%			4.10	%			N/A				N/A
Rates of annual increase in compensation levels			3.00	%			3.00	%			N/A				N/A

Schedule of Expected Benefit Payments

Based upon the assumptions used to measure the company’s qualified pension and postretirement benefit obligations at December 31, 2017, including pension and postretirement benefits attributable to estimated future employee service, the company expects that benefits to be paid over the next ten years will be as follows:

		(In thousands)
Year ending December 31,		Pension Benefits				Other Benefits
2018		$	15,350				282
2019			5,812				301
2020			5,877				311
2021			5,966				302
2022			5,978				287
2023 – 2027			30,440				1,212
Total 10-year estimated future benefit payments		$	69,423				2,695

Assumed Health Care Cost Trends Rates

The following table discloses the assumed health care cost trends used in measuring the accumulated postretirement benefit obligation and net periodic postretirement benefit cost at December 31, 2017 for pre-65 medical and prescription drug coverage, including expected future trend rates.

		Pre-65
Year ending December 31, 2017:
Accumulated postretirement benefit obligation			7.60	%
Net periodic postretirement benefit obligation			7.60	%
Ultimate health care cost trend			4.54	%
Ultimate year health care cost trend rate is achieved			2038
Year ending December 31, 2018:
Net periodic postretirement benefit obligation			7.45	%

One-Percentage Rate Change in Assumed Health Care Cost Trend Rates and Its Effects on Accumulated Postretirement Benefit Obligation

A one-percentage rate increase (decrease) in the assumed health care cost trend rates has the following effects on the accumulated postretirement benefit obligation as of December 31:

(In thousands)		1% Increase				1% Decrease
Accumulated postretirement benefit obligation		$	10,715				9,603
Aggregate service and interest cost			208,009				188,345

Number of Tidewater Common Stock Shares, Series A Warrants and Series B Warrants Held

The plan held the following number of shares of Tidewater common stock, series A warrants and series B warrants:

		Successor				Predecessor
		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Number of shares of Tidewater common stock held by 401(k) plan			8,074				264,504				291,957
Number of shares of Tidewater Series A warrants held by 401(k) plan			9,030				—				—
Number of shares of Tidewater Series B warrants held by 401(k) plan			9,762				—				—

Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses

The following table summarizes the carrying value of the trust assets, including unrealized gains or losses at June 30, 2018 and December 31, 2017:

		Successor
(In thousands)		June 30, 2018				December 31, 2017
Investments held in Rabbi Trust at fair value		$	45				8,908
Unrealized gains in fair value of trust assets			—				256
Obligations under the supplemental plan			23,797				32,508

Plan 401 k

Amounts Charged to Expense Related to Contribution Plans

The amounts charged to expense related to the above defined contribution plans are as follows:

		Successor				Predecessor
(In thousands)		Period from August 1, 2017 through December 31, 2017				Period from April 1, 2017 through July 31, 2017				Year Ended March 31, 2017
Defined contribution plans expense, net of forfeitures		$	854				871				2,660
Defined contribution plans forfeitures			83				79				149

Multinational Retirement Plan

Amounts Charged to Expense Related to Contribution Plans

The amounts charged to expense related to the multinational retirement plan and multinational savings plan contributions are as follows:

Successor

Predecessor

(In thousands)

Period from August 1, 2017 through December 31, 2017

Period from April 1, 2017 through July 31, 2017

Year Ended March 31, 2017

Multinational plan expense

$

81

67

260

X

- Definition

Expected Long Term Rate Of Return On Plan Assets [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ExpectedLongTermRateOfReturnOnPlanAssetsTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expenses Related To Defined Contributions Plan [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ExpensesRelatedToDefinedContributionsPlanTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Carrying Value Of Trust Assets And Obligations Under Supplemental Plan Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfCarryingValueOfTrustAssetsAndObligationsUnderSupplementalPlanTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Carrying Value Of Trust Assets Including Unrealized Gains Or Losses Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfCarryingValueOfTrustAssetsIncludingUnrealizedGainsOrLossesTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Fair Value Plan Assets Measured On Recurring Basis Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfFairValuePlanAssetsMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Minimum And Maximum Market Value Of Plan Assets Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfMinimumAndMaximumMarketValueOfPlanAssetsTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Number Of Common Stock Shares Held Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfNumberOfCommonStockSharesHeldTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule Of Unrealized Loss Gains In Carrying Value Of Trust Assets Table [Text Block]

+ References

No definition available.

+ Details

Name:	tdw_ScheduleOfUnrealizedLossGainsInCarryingValueOfTrustAssetsTableTextBlock
Namespace Prefix:	tdw_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920

+ Details

Name:	us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfAmountsInAccumulatedOtherComprehensiveIncomeLossToBeRecognizedOverNextFiscalYearTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfDefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of net funded status of pension plans and/or other employee benefit plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfNetFundedStatusTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=tdw_Plan401KMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=tdw_MultinationalRetirementPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: