Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Commitments And Contingencies Disclosure [Abstract]
Royalty percentage of the sales of licensed products, Minimum	1.00%
Royalty percentage of the sales of licensed products, Maximum	14.00%
Annual royalty expenses	$ 3,611	$ 3,040	$ 1,853
2014	7,921
2015	170
Thereafter	0
Expenses under operating leases	1,744	1,524	1,391
2014	1,370
2015	922
2016	670
2017	342
2018	320
Payments for indemnifications and liability	$ 0	$ 0

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Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year.

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Payments for indemnifications and liability.

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Royalty percentage of sale of licensed product maximum.

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Royalty percentage of sale of licensed product minimum.

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Unrecorded unconditional purchase obligation due after second year.

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