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Summary of Deferred Stock Unit Activity (Detail) - $ / shares | 12 Months Ended
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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

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalents Reinvested + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalents Reinvested Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Retirement Distributions + References No definition available. + Details
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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 + References No definition available. + Details
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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 + Details
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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 + Details
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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 + Details
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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 + Details
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