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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail)	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Weighted average rates	2.98%	2.52%
Minimum [Member]
Debt Instrument [Line Items]
Range of effective rates	2.37%	2.19%
Maximum [Member]
Debt Instrument [Line Items]
Range of effective rates	5.00%	4.50%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Details

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