Stock-based Compensation - Schedule of Fair Value at the Date of Grant (Detail)	12 Months Ended
	Sep. 30, 2013
Fiscal 2011 - 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Shares	13,707
Target Shares	68,533
Maximum Shares	122,053
Fiscal 2012 - 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Shares	12,499
Target Shares	62,497
Maximum Shares	124,994
Fiscal 2013 - 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Shares	8,551
Target Shares	42,753
Maximum Shares	85,506