Summary of Significant Accounting Policies and Select Balance Sheet Information - Amortized Cost, Unrealized Holding Gains (Losses) and Fair Value of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Significant Accounting Policies [Line Items]
Amortized Cost	$ 42,522	$ 42,186
Unrealized Gains	184	405
Unrealized Losses	(97)	(41)
Fair Value	42,609	42,550
U.S. government and government agency obligations [Member]
Significant Accounting Policies [Line Items]
Amortized Cost	22,889	28,641
Unrealized Gains	28	213
Unrealized Losses	(27)
Fair Value	22,890	28,854
Mortgage-backed Securities [Member]
Significant Accounting Policies [Line Items]
Amortized Cost	8,149	2,896
Unrealized Gains	118	129
Unrealized Losses	(51)	(26)
Fair Value	8,216	2,999
Municipal Bonds [Member]
Significant Accounting Policies [Line Items]
Amortized Cost	3,049	3,178
Unrealized Gains	15	35
Unrealized Losses	(5)
Fair Value	3,059	3,213
Asset-backed Securities [Member]
Significant Accounting Policies [Line Items]
Amortized Cost	3,539	613
Unrealized Gains	6
Unrealized Losses	(8)	(15)
Fair Value	3,537	598
Corporate Bonds [Member]
Significant Accounting Policies [Line Items]
Amortized Cost	4,896	6,858
Unrealized Gains	17	28
Unrealized Losses	(6)
Fair Value	$ 4,907	$ 6,886