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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment [Line Items]
Number of financial institutions	1,059
Number of companies deployed Mobile Deposit	559
Number of retail banks and payment processing companies	33
Allowance for doubtful accounts	$ 16,000	$ 17,773
Net unrealized loss	3,561
Net unrealized losses		616
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Amortization of software development costs	$ 0	$ 0

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Net amount of accumulated unrealized gains (losses) on Investment in available-for-sale that are recognized in AOCI.

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Number of domestic retail banks and payment processing companies.

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Number of financial institutions that deployed software.

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Number of financial institutions that signed agreement.

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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