Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Inputs, Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Financial assets	$ 0	$ 0
Financial liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Financial assets	0	0
Financial liabilities	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Financial assets	0	0
Financial liabilities	$ 0	$ 0