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Shareholder Rights Plan - Additional Information (Detail) - $ / shares | 1 Months Ended | 12 Months Ended
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Nov. 30, 2008 | Mar. 31, 2018
Equity [Abstract] |  |
Dividend distribution ratio of preferred share purchase right for outstanding share of common stock |  | 100.00%
Shareholder rights exercise price |  | $ 118
Shareholder rights expiration date | Feb. 10, 2022 |
Shareholder Rights Plan, description of acquired entity |  | Shareholder Rights Plan provides that if a person or group acquires 15% or more of the Company’s common stock
Shareholder Rights Plan, percentage of acquired entity |  | 15.00%
Shareholder Rights Plan, description of merged entity |  | Company is thereafter merged into another entity, or if 50% or more of the Company’s consolidated assets or earning power are sold, then the right would entitle its holder to buy common shares of the acquiring entity having a market value equal to two times the then-current exercise price of the right.
Shareholder Rights Plan, percentage of merged entity |  | 50.00%

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- Definition Dividend distribution ratio of preferred share purchase right for outstanding share of common stock. + References No definition available. + Details
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- Definition Generally, the Shareholder Rights Plan provides that if a person or group acquires a certain percentage more of the Company's common stock without the approval of the Board, subject to certain exceptions, the holders of the rights, other than the acquiring person or group, would, under certain circumstances, have the right to purchase additional shares of the Company's common stock have a market value equal to two times the then-current exercise price of the right. + References No definition available. + Details
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- Definition If 50% or more of the Company's consolidated assets or earning power are sold, then the right will entitle its holder to buy common shares of the acquiring entity having a market value equal to two times the then-current exercise price of the right. + References No definition available. + Details
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- Definition Generally, the Shareholder Rights Plan provides that if a person or group acquires a certain percentage more of the Company's common stock without the approval of the Board, subject to certain exceptions, the holders of the rights, other than the acquiring person or group, would, under certain circumstances, have the right to purchase additional shares of the Company's common stock have a market value equal to two times the then-current exercise price of the right. + References No definition available. + Details
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- Definition If 50% or more of the Company's consolidated assets or earning power are sold, then the right will entitle its holder to buy common shares of the acquiring entity having a market value equal to two times the then-current exercise price of the right. + References No definition available. + Details
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- Definition Expiration date of the Shareholder Rights Plan. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- References No definition available. + Details
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