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Common Stock and Class B Common Stock Preferred Share Purchase Rights (Details) | Sep. 24, 2017 USD ($) $ / shares
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Class of Warrant or Right [Line Items] |
Preferred Share Purchase Rights- Exercise Price | $ | $ 150
Preferred Stock, Redemption Price Per Share | $ / shares | $ 0.001
2008 And After [Member] |
Class of Warrant or Right [Line Items] |
Beneficial OwnershipThreshold | 25.00%
Beneficial Ownership Threshold | 15.00%
Beneficial Ownership Percentage- Upper Limit | 50.00%
Prior To 2008 [Member] |
Class of Warrant or Right [Line Items] |
Beneficial OwnershipThreshold | 20.00%

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- Definition Beneficial Ownership Percentage- Upper Limit- limit of ownership before rights change under the preferred share purchase plan. + References No definition available. + Details
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- Definition Beneficial Ownership Threshold- threshold for exercising preferred share purchase rights for all investors with the exception of passive investors. + References No definition available. + Details
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- Definition Beneficial OwnershipThreshold- Passive investor threshold for excercising rights under a preferred stock plan. + References No definition available. + Details
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- Definition Preferred Share Purchase Rights- Exercise Price + References No definition available. + Details
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Balance Type: | credit
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- 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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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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- Details
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- Details
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