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Long Term Debt - Additional Information (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013
Debt Disclosure [Abstract]
Long term debt outstanding	$ 0	$ 0
Total cash deposits with insurance companies covering collateral needs	$ 135,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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