Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended			12 Months Ended
	Sep. 30, 2014 2009 Plan [Member]	Sep. 30, 2014 1997 Plan [Member]	Jul. 01, 2011 July 1, 2011 Common Stock Options Issued [Member] 2009 Plan [Member]	Sep. 30, 2014 July 1, 2011 Common Stock Options Issued [Member] 2009 Plan [Member]	May 28, 2012 May 28, 2012 Common Stock Options Issued [Member] 2009 Plan [Member]	Sep. 30, 2014 May 28, 2012 Common Stock Options Issued [Member] 2009 Plan [Member]	Sep. 30, 2014 Common Stock [Member] 2009 Plan [Member]	Mar. 17, 2009 Common Stock [Member] 2009 Plan [Member]	Sep. 30, 2014 Common Stock [Member] 1997 Plan [Member]	Sep. 30, 2014 Class B Stock [Member] 2009 Plan [Member]	Mar. 17, 2009 Class B Stock [Member] 2009 Plan [Member]	Sep. 30, 2014 Class B Stock [Member] 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	0		298,000		20,000
Options vesting rate			25.00%		25.00%
Options vesting period				Options vest at 25% per year starting on October 1, 2012 and each year thereafter through October 1, 2015		Options vest at 25% per year starting on May 28, 2013 and each year thereafter through May 28, 2016
Options exercisable				Oct. 01, 2021		Oct. 01, 2021
Estimated fair value of options at time of grant			$ 941,000		$ 63,000
Compensation expense remaining to be expensed				$ 237,000		$ 27,000
Shares available for granting		0					482,000			160,000
Remaining contractual life on the options outstanding	7 years	2 years
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