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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2013 Option 2009 Plan [Member] | May 28, 2012 The 2009 Plan [Member] | Sep. 30, 2013 The 2009 Plan [Member] | Sep. 30, 2013 Option 1997 Plan [Member] | Jul. 01, 2011 Common Stock [Member] Option 2009 Plan [Member] | Mar. 17, 2009 Common Stock [Member] Option 2009 Plan [Member] | Sep. 30, 2013 Common Stock [Member] The 2009 Plan [Member] | Sep. 30, 2013 Common Stock [Member] Option 1997 Plan [Member] | Mar. 17, 2009 Class B Stock [Member] Option 2009 Plan [Member] | Sep. 30, 2013 Class B Stock [Member] The 2009 Plan [Member] | Sep. 30, 2013 Class B Stock [Member] Option 1997 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares granting of awards |  |  |  |  |  |  | 800,000 |  | 1,200,000 | 160,000 |  | 1,200,000
Common stock options issued to employees |  |  |  |  |  | 298,000 |  |  |  |  |  |
Options vesting rate |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |
Options vesting period |  |  |  |  |  | October 1, 2012 through October 1, 2015 |  |  |  |  |  |
Options exercisable |  | Through October 1, 2021 |  |  |  |  |  |  |  |  |  |
Estimated fair value of number options at time of grant |  |  |  |  |  | $ 941,000 |  |  |  |  |  |
Compensation expense remaining to be expensed | 474,000 |  |  |  |  |  |  |  |  |  |  |
Common stock options issued to an employee |  |  | 20,000 |  |  |  |  |  |  |  |  |
Compensation expense remaining to be expensed | 43,000 |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of maximum number options at time of grant |  |  | $ 63,000 |  |  |  |  |  |  |  |  |
Options vesting period |  |  |  | Through May 28,2016 |  |  |  |  |  |  |  |
Shares available for granting |  |  |  |  | 0 |  |  | 482,000 |  |  | 160,000 |
Remaining contractual life on the options outstanding |  |  |  | 8 years | 3 years |  |  |  |  |  |  |
Number of options, granted |  |  |  | 0 |  |  |  |  |  |  |  |
Number of options, exercised |  |  |  | 0 |  |  |  |  |  |  |  |
Number of options, forfeited or cancelled |  |  |  | 0 |  |  |  |  |  |  |  |
Percentage of common stock to be purchased of authorized common stock of any subsidiary |  |  |  |  |  |  |  |  | 15.00% |  |  |
Options expiration period after date of grant |  |  |  |  | 10 years |  |  |  |  |  |  |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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