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Stockholder's Equity (Narrative) (Details) | 12 Months Ended
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Sep. 30, 2017 item
Class of Stock [Line Items] |
Percentage of cash dividend or liquidation payment based on Class B common stock | 110.00%
Minimum [Member] |
Class of Stock [Line Items] |
Number of directors that can be set by board of directors | 5
Maximum [Member] |
Class of Stock [Line Items] |
Number of directors that can be set by board of directors | 11
Class A Common Stock [Member] |
Class of Stock [Line Items] |
Number of votes per share held by common stock holders | 1
Percentage of directors to be elected by holders of common stock | 25.00%
Class B Common Stock [Member] |
Class of Stock [Line Items] |
Number of votes per share held by common stock holders | 10
Minimum percentage of outstanding common stock of both classes represented by common stock | 12.50%

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- Definition Number of directors. + References No definition available. + Details
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- Definition Number of votes per share held by common stock holders. + References No definition available. + Details
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- Definition Percentage of cash dividend or liquidation payment on class B common stock payable to other class common stock. + References No definition available. + Details
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X
- Definition Percentage of common stock for class B common stock. + References No definition available. + Details
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- Definition Percentage of directors to be elected by holders of common stock. + References No definition available. + Details
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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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