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Employee 401(k) Profit Sharing Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]
Duration of profit sharing plan	90 days
Introductory period of profit sharing	April 1 or October 1
Employees eligibility age for participating in profit sharing plan	21 years
Total participants contributions in Profit sharing plan	25.00%
Maximum of each participants compensation	5.00%
Contribution under the Profit sharing plan	$ 463,000	$ 440,000	$ 298,000

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Duration of profit sharing plan.

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- Definition

Employees eligibility age for participating in profit sharing plan.

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- Definition

Introductory period of profit sharing plan.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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