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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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