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Summary of Debt Outstanding (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Term Loan Facility    
Debt [Line Items]    
Term loan agreement [1] $ 300,000 $ 300,000
Revolving Credit Agreement    
Debt [Line Items]    
Revolving line of credit [1],[2]   20,000
September 2013 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding $ 500,000 $ 500,000
Weighted average remaining life in years 7 years 10 months 24 days 8 years 4 months 24 days
Weighted average coupon rate on notes outstanding 4.86% 4.86%
Fair value of debt outstanding (Level 2) $ 453,216 $ 516,879
August 2011 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding $ 165,000 $ 165,000
Weighted average remaining life in years 5 years 1 month 6 days 5 years 7 months 6 days
Weighted average coupon rate on notes outstanding 4.42% 4.42%
Fair value of debt outstanding (Level 2) $ 151,763 $ 167,910
September 2010 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding [3] $ 425,000 $ 425,000
Weighted average remaining life in years [3] 4 years 1 month 6 days 4 years 7 months 6 days
Weighted average coupon rate on notes outstanding [3] 4.25% 4.25%
Fair value of debt outstanding (Level 2) [3] $ 401,182 $ 431,296
July 2003 Senior Unsecured Notes    
Debt [Line Items]    
Aggregate debt outstanding [4]   $ 35,000
Weighted average remaining life in years [4] 0 years 3 months 18 days
Weighted average coupon rate on notes outstanding [4]   4.61%
Fair value of debt outstanding (Level 2) [4]   $ 35,197
March 2015 United States Dollar Denominated Borrowing Agreement    
Debt [Line Items]    
Fair value of debt outstanding (Level 2) [5] $ 28,262 29,501
Amount outstanding [5] 28,259 $ 29,488
May 2015 United States Dollar Denominated Borrowing Agreement    
Debt [Line Items]    
Fair value of debt outstanding (Level 2) [5],[6] 31,497  
Amount outstanding [5],[6] $ 31,338  
[1] Fair values approximate carrying values because the borrowings bear interest at variable rates.
[2] $600 million and $580 million was available under the revolver at September 30, 2015 and March 31, 2015, respectively.
[3] Principal repayments of approximately $42.5 million due during the twelve months ending September 30, 2016 are classified as long term debt in the accompanying balance sheet at September 30, 2015 because the company has the ability and intent to fund the repayments with borrowings under the credit facility which matures in June 2019.
[4] Remaining $35 million of borrowings were fully paid in July 2015.
[5] Notes require semi-annual principal payments.
[6] In May 2015, a wholly owned subsidiary of the company entered into a $31.3 million, U.S. dollar denominated, 12 year unsecured borrowing agreement which matures in April 2027 and is secured by a guarantee by Tidewater Inc. The loan requires semi-annual principal payments of $1.3 million (plus accrued interest) and bears interest at a fixed rate of 2.92% plus a spread based on Tidewater Inc.'s consolidated funded indebtedness to total capitalization ratio (currently equal to 1.30% for a total rate of 4.22%).