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Treasury Stock - Additional Information (Detail) - shares | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 08, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Feb. 28, 2017
Class of Stock [Line Items] |  |  |  |  |
Number of shares of common stock authorized to repurchase |  | 36,000,000 |  |  | 1,000,000
Number of shares repurchases of common stock |  | 249,245 | 745,575 | 893,771 |
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares repurchases of common stock | 0 |  |  |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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