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, 2014	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 18,347	$ 42,522
Unrealized Gains	1,617	184
Unrealized Losses	(101)	(97)
Fair Value	19,863	42,609
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,173	3,049
Unrealized Gains	5	15
Unrealized Losses	(3)	(5)
Fair Value	1,175	3,059
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,829	4,896
Unrealized Gains	6	17
Unrealized Losses	(5)	(6)
Fair Value	1,830	4,907
U.S. government and government agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,397	22,889
Unrealized Gains	12	28
Unrealized Losses	(15)	(27)
Fair Value	7,394	22,890
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,576	8,149
Unrealized Gains	43	118
Unrealized Losses	(74)	(51)
Fair Value	5,545	8,216
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,370	3,539
Unrealized Gains	3	6
Unrealized Losses	(4)	(8)
Fair Value	2,369	3,537
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2
Unrealized Gains	1,548
Fair Value	$ 1,550