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Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015
Revolving Credit Agreement
Debt [Line Items]
Revolving credit facility, remaining borrowing capacity	$ 600.0	$ 580.0
September 2010 Senior Unsecured Notes
Debt [Line Items]
Principal repayments due during the twelve months ending June 30, 2016	$ 42.5

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.19(b),22(b))



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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 3



-Subparagraph (SX 210.12-04.(a))



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 470



-SubTopic 10



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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