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Summary of Deferred Stock Unit Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding	$ 23.58	$ 39.53	$ 48.68
Weighted-average Grant-Date Fair Value, Dividend equivalents reinvested		13.36	34.63
Weighted-average Grant-Date Fair Value, Retirement distribution	6.83	19.14	47.50
Weighted-average Grant-Date Fair Value, Granted		6.83	19.14
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding	$ 24.19	$ 23.58	$ 39.53
Number of Shares Beginning Balance Outstanding	363,630	185,060	146,388
Number of Shares, Dividend equivalents reinvested		15,064	3,794
Number of Shares, Retirement distribution	(12,792)	(4,874)	(21,492)
Number of Shares, Granted		168,380	56,370
Number of Shares Ending Balance Outstanding	350,838	363,630	185,060

X

- Definition

Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalents Reinvested

+ References

No definition available.

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Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalents Reinvested Weighted Average Grant Date Fair Value

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Retirement Distributions

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Retirement Distributions Weighted Average Grant Date Fair Value

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No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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