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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
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