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Consolidated Statements of Equity (USD $)
In Thousands
Total
Common stock
Additional paid- in capital
Retained earnings
Accumulated other comprehensive loss
Non controlling interest
Balance at Mar. 31, 2012 $ 2,526,357us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 5,125us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 102,726us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,437,836us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (19,330)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Total comprehensive income 152,939us-gaap_ComprehensiveIncomeNetOfTax     150,750us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
2,189us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Stock option activity 6,145us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense 14us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,131us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Cash dividends declared ($1.00 per share) (49,766)us-gaap_DividendsCommonStockCash     (49,766)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Retirement of common stock (85,034)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue (187)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (84,847)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Amortization of restricted stock units 6,711us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition 6us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,705us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Amortization/cancellation of restricted stock 4,404tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures (9)tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
4,413tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Balance at Mar. 31, 2013 2,561,756us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 4,949us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
119,975us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,453,973us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(17,141)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Total comprehensive income 145,171us-gaap_ComprehensiveIncomeNetOfTax     140,255us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
4,916us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Stock option activity 9,465us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense 20us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,445us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Cash dividends declared ($1.00 per share) (49,973)us-gaap_DividendsCommonStockCash     (49,973)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Amortization of restricted stock units 9,933us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition 10us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,923us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Amortization/cancellation of restricted stock 3,032tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures (6)tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
3,038tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Noncontrolling interests 5,987us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance         5,987us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at Mar. 31, 2014 2,685,371us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 4,973us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
142,381us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,544,255us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(12,225)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
5,987us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Total comprehensive income (73,502)us-gaap_ComprehensiveIncomeNetOfTax     (65,190)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(8,153)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(159)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Stock option activity (688)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(691)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Cash dividends declared ($1.00 per share) (49,127)us-gaap_DividendsCommonStockCash     (49,127)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Retirement of common stock (99,999)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue (284)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (99,715)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Amortization of restricted stock units 15,287us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition 17us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
15,270us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Amortization/cancellation of restricted stock 2,974tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures (6)tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,980tdw_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitOrRestrictedStockAwardRequisiteServicePeriodRecognitionNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Cash received from non-controlling interests, net 399us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest         399us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at Mar. 31, 2015 $ 2,480,715us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 4,703us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 159,940us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,330,223us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (20,378)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 6,227us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember