Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended			12 Months Ended	1 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2015 Scenario, Forecast [Member]	Oct. 23, 2014 Subsequent Event [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Credit Concentration Risk [Member] Accounts Receivable [Member] Customer	Mar. 31, 2014 Credit Concentration Risk [Member] Accounts Receivable [Member] Customer	Sep. 30, 2014 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer	Sep. 30, 2013 Customer Concentration Risk [Member] Sales Revenue, Net [Member] Customer	Sep. 30, 2014 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of shares authorized to repurchase	186,506	309,952				76,624
Share price	$ 7,400,000	$ 13,200,000				$ 2,549,000
Average price		$ 10.53				$ 33.27
Maturities of short term investment interest-bearing securities		90 days
Transfer of assets													0	0
Investments approved by board of directors			2,000,000
Investment in private equity		800,000			1,200,000
Impairment on investment	0
Accounts receivable due period		30 days
Maximum customer risk percentage									10.00%	10.00%	10.00%	10.00%
Number of customer									0	0	0	0
Estimated useful life of property and equipment							1 year	7 years
Amortization period of computer software		5 years
Unrecognized tax benefits	$ 964,000	$ 964,000		$ 700,000