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Summary of Long-Term Debt Outstanding (Parenthetical) (Detail)	12 Months Ended
	Mar. 31, 2014
4.44% July 2003 Senior Notes Due Fiscal 2014
Debt [Line Items]
Debt instrument interest rate	4.44%
Debt Instrument Maturity Period	Fiscal 2014
4.61% July 2003 Senior Notes Due Fiscal 2016
Debt [Line Items]
Debt instrument interest rate	4.61%
Debt Instrument Maturity Period	Fiscal 2016
3.28% September 2010 Senior Notes Due Fiscal 2016
Debt [Line Items]
Debt instrument interest rate	3.28%
Debt Instrument Maturity Period	Fiscal 2016
3.90% September 2010 Senior Notes Due Fiscal 2018
Debt [Line Items]
Debt instrument interest rate	3.90%
Debt Instrument Maturity Period	Fiscal 2018
3.95% September 2010 Senior Notes Due Fiscal 2018
Debt [Line Items]
Debt instrument interest rate	3.95%
Debt Instrument Maturity Period	Fiscal 2018
4.12% September 2010 Senior Notes Due Fiscal 2019
Debt [Line Items]
Debt instrument interest rate	4.12%
Debt Instrument Maturity Period	Fiscal 2019
4.17% September 2010 Senior Notes Due Fiscal 2019
Debt [Line Items]
Debt instrument interest rate	4.17%
Debt Instrument Maturity Period	Fiscal 2019
4.33% September 2010 Senior Notes Due Fiscal 2020
Debt [Line Items]
Debt instrument interest rate	4.33%
Debt Instrument Maturity Period	Fiscal 2020
4.51% September 2010 Senior Notes Due Fiscal 2021
Debt [Line Items]
Debt instrument interest rate	4.51%
Debt Instrument Maturity Period	Fiscal 2021
4.56% September 2010 Senior Notes Due Fiscal 2021
Debt [Line Items]
Debt instrument interest rate	4.56%
Debt Instrument Maturity Period	Fiscal 2021
4.61% September 2010 Senior Notes Due Fiscal 2023
Debt [Line Items]
Debt instrument interest rate	4.61%
Debt Instrument Maturity Period	Fiscal 2023
4.06% August 2011 Senior Notes Due Fiscal 2019
Debt [Line Items]
Debt instrument interest rate	4.06%
Debt Instrument Maturity Period	Fiscal 2019
4.54% August 2011 Senior Notes Due Fiscal 2022
Debt [Line Items]
Debt instrument interest rate	4.54%
Debt Instrument Maturity Period	Fiscal 2022
4.64% August 2011 Senior Notes Due Fiscal 2022
Debt [Line Items]
Debt instrument interest rate	4.64%
Debt Instrument Maturity Period	Fiscal 2022
4.26% September 2013 senior notes due fiscal 2021
Debt [Line Items]
Debt instrument interest rate	4.26%
Debt Instrument Maturity Period	Fiscal 2021
5.01% September 2013 senior notes due fiscal 2024
Debt [Line Items]
Debt instrument interest rate	5.01%
Debt Instrument Maturity Period	Fiscal 2024
5.16% September 2013 senior notes due fiscal 2026
Debt [Line Items]
Debt instrument interest rate	5.16%
Debt Instrument Maturity Period	Fiscal 2026
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Five
Debt [Line Items]
Debt Instrument Maturity Period	Fiscal 2025
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Six
Debt [Line Items]
Debt Instrument Maturity Period	Fiscal 2026
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Fifteen
Debt [Line Items]
Debt Instrument Maturity Period	Fiscal 2015
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Nineteen
Debt [Line Items]
Debt Instrument Maturity Period	Fiscal 2019

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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