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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014 Y	Mar. 31, 2013 Y
September 2013 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	$ 500,000
Weighted average remaining life in years	9.4
Weighted average coupon rate on notes outstanding	4.86%
Fair value of debt outstanding	520,979
August 2011 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	165,000	165,000
Weighted average remaining life in years	6.6	7.6
Weighted average coupon rate on notes outstanding	4.42%	4.42%
Fair value of debt outstanding	168,653	179,802
September 2010 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	425,000	425,000
Weighted average remaining life in years	5.6	6.6
Weighted average coupon rate on notes outstanding	4.25%	4.25%
Fair value of debt outstanding	436,254	458,520
July 2003 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	35,000	175,000
Weighted average remaining life in years	1.3	0.7
Weighted average coupon rate on notes outstanding	4.61%	4.47%
Fair value of debt outstanding	$ 36,018	$ 178,227

X

- Definition

Weighted Average Life To Maturity

+ References

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X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611

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X

- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



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

-Article 5

-Subsection 19, 20, 22

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