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Summary of Long-Term Debt Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Debt [Line Items] |  |
Long-Term Debt Outstanding | $ 2,052,270 | $ 1,534,476
Less: Current maturities of long-term debt | 2,052,270 | 10,181
Long-term debt |  | 1,524,295
4.61% July 2003 Senior Notes Due Fiscal 2016 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding |  | 35,000
3.28% September 2010 Senior Notes Due Fiscal 2016 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding |  | 42,500
3.90% September 2010 Senior Notes Due Fiscal 2018 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 44,500 | 44,500
3.95% September 2010 Senior Notes Due Fiscal 2018 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 25,000 | 25,000
4.12% September 2010 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 25,000 | 25,000
4.17% September 2010 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 25,000 | 25,000
4.33% September 2010 Senior Notes Due Fiscal 2020 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 50,000 | 50,000
4.51% September 2010 Senior Notes Due Fiscal 2021 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 100,000 | 100,000
4.56% September 2010 Senior Notes Due Fiscal 2021 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 65,000 | 65,000
4.61% September 2010 Senior Notes Due Fiscal 2023 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 48,000 | 48,000
4.06% August 2011 Senior Notes Due Fiscal 2019 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 50,000 | 50,000
4.54% August 2011 Senior Notes Due Fiscal 2022 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 65,000 | 65,000
4.64% August 2011 Senior Notes Due Fiscal 2022 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 50,000 | 50,000
4.26% September 2013 senior notes due fiscal 2021 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 123,000 | 123,000
5.01% September 2013 senior notes due fiscal 2024 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 250,000 | 250,000
5.16% September 2013 senior notes due fiscal 2026 |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 127,000 | 127,000
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Five |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 17,500 | 20,152
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Six |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 30,207 | 34,234
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Sixteen |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding |  | 2,490
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Nineteen |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding |  | 3,112
United States Dollar Denominated Borrowing Agreement Due Fiscal Two Thousand Twenty Seven |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 27,030 | 29,488
United States Dollar Denominated Borrowing Agreement Due Fiscal Two Thousand Twenty Eight |  |
Debt [Line Items] |  |
Long-Term Debt Outstanding | 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 | $ 20,000

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