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Summary Debt Outstanding Based On Stated Maturities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Debt [Line Items] |  |
Long-term Debt, Gross | $ 2,040,525 | $ 2,052,270
Less: Deferred debt issue costs | 6,401 | 6,754
Total debt | 2,034,124 | 2,045,516
3.90% September 2010 Senior Notes Due Fiscal 2018 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 44,500 | 44,500
3.95% September 2010 Senior Notes Due Fiscal 2018 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 25,000 | 25,000
4.12% September 2010 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 25,000 | 25,000
4.17% September 2010 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 25,000 | 25,000
4.33% September 2010 Senior Notes Due Fiscal 2020 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 50,000 | 50,000
4.51% September 2010 Senior Notes Due Fiscal 2021 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 100,000 | 100,000
4.56% September 2010 Senior Notes Due Fiscal 2021 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 65,000 | 65,000
4.61% September 2010 Senior Notes Due Fiscal 2023 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 48,000 | 48,000
4.06% August 2011 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 50,000 | 50,000
4.54% August 2011 Senior Notes Due Fiscal 2022 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 65,000 | 65,000
4.64% August 2011 Senior Notes Due Fiscal 2022 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 50,000 | 50,000
4.26% September 2013 senior notes due fiscal 2021 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 123,000 | 123,000
5.01% September 2013 senior notes due fiscal 2024 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 250,000 | 250,000
5.01% September 2013 senior notes due fiscal 2024 |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 127,000 | 127,000
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Five |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 14,864 | 17,500
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Six |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 26,167 | 30,207
United States Dollar Denominated Borrowing Agreement Due Fiscal Two Thousand Twenty Seven |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 24,573 | 27,030
United States Dollar Denominated Borrowing Agreement Due Fiscal Two Thousand Twenty Eight |  |
Debt [Line Items] |  |
Long-term Debt, Gross | 27,421 | 30,033
Term Loan Facility Due Twenty Twenty |  |
Debt [Line Items] |  |
Term loan | 300,000 | 300,000
Revolving Line Of Credit Due Fiscal Twenty Twenty |  |
Debt [Line Items] |  |
Revolving line of credit | $ 600,000 | $ 600,000

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