Entity Wide Revenue, Major Customer, Number

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Percentage of total revenues, by customer

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Share Based Compensation Arrangement by Share Based Payment Award, Financial Performance Measurement Period

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Share Based Compensation Arrangement by Share Based Payment Award Maximum Exercisable Period for Stock Options

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Significant Accounting Policies [Line Items]

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Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash equivalents may be reported as cash equivalents, while legally restricted equivalents held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular equivalents are not generally reported as part of unrestricted cash equivalents.

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-Publisher FASB

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-Name Statement of Financial Accounting Standard (FAS)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Article 5

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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-Subparagraph a(1)

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-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

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-Topic 718

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2011 Year Month Person Entity	Sep. 30, 2010 Entity Month	Sep. 30, 2009 Month Person Entity
Significant Accounting Policies [Line Items]
Net foreign currency transaction losses	$ 100,000	$ 300,000	$ 600,000
Cash equivalents	9,600,000	21,100,000
Number of major customer by revenue	2	3	1
Intangible assets, net	44,314,000	11,123,000
Shares available for grant	5,266,210
Restricted stock
Significant Accounting Policies [Line Items]
Restricted stocks granted	1,046,000
Restricted stock \| Awards subject to performance criteria \| Senior Management
Significant Accounting Policies [Line Items]
Restricted stocks granted	183,000
Restricted stocks granted, financial performance measurement year	2013
Restricted stock \| Awards subject to service criteria \| Senior Management
Significant Accounting Policies [Line Items]
Restricted stocks granted	183,000
Restricted stock \| Senior Management
Significant Accounting Policies [Line Items]
Restricted stocks granted	366,000
Restricted stock \| Senior Management \| Maximum
Significant Accounting Policies [Line Items]
Total share based compensation awards	4,500,000
Restricted stock \| Maximum
Significant Accounting Policies [Line Items]
Equity incentive plans, vesting period	4 years
Restricted stock \| Minimum
Significant Accounting Policies [Line Items]
Equity incentive plans, vesting period	2 years
Stock options
Significant Accounting Policies [Line Items]
Equity incentive plans, vesting period	4 years
Stock options \| Maximum
Significant Accounting Policies [Line Items]
Equity incentive plans, maximum exercisable period	7 years
Awards subject to performance criteria
Significant Accounting Policies [Line Items]
Restricted stocks granted			178,346
Patents
Significant Accounting Policies [Line Items]
Intangible assets, net	$ 819,000	$ 922,000
Top Ten Largest Customers
Significant Accounting Policies [Line Items]
Percentage of revenues by customer	55.00%
Number of major customer by revenue	2
Customer 1
Significant Accounting Policies [Line Items]
Percentage of revenues by customer	15.00%	21.00%	14.00%
Customer 2
Significant Accounting Policies [Line Items]
Percentage of revenues by customer	13.00%	15.00%