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Long-Term Debt - Additional Information (Detail) (USD $) | 9 Months Ended |  | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Oct. 31, 2011 Revolving loan | Jun. 30, 2014 Revolving loan Minimum | Jun. 30, 2014 Revolving loan Maximum | Oct. 31, 2011 Credit Agreement Amendment | Oct. 31, 2011 Term loan | Jun. 30, 2014 Term loan | Oct. 31, 2011 Credit Facility Term One Credit Agreement Amendment | Oct. 31, 2011 Credit Facility Term Two Credit Agreement Amendment
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit agreement, maximum borrowing amount |  |  | $ 30,000,000 |  |  | $ 40,000,000 |  |  |  |
Proceeds from revolving credit agreement | 28,464,000 | 37,563,000 |  |  |  |  |  |  | 10,000,000 | 30,000,000
Period of credit agreement (in years) |  |  |  |  |  |  |  |  | 5 years | 5 years
Percentage of stock of non-U.S. subsidiaries pledged |  |  |  |  |  | 65.00% |  |  |  |
Quarterly installments payment |  |  |  |  |  |  | $ 500,000 |  |  |
Quarterly installments payment starting date |  |  |  |  |  |  |  | Dec. 01, 2011 |  |
Libor-based variable interest rate of term loan |  |  |  |  |  |  |  | 2.20% |  |
Effective fixed rate on term loan |  |  |  |  |  |  |  | 2.90% |  |
Interest rate on revolving loan, percentage added to Libor |  |  |  | 0.75% | 1.75% |  |  |  |  |
Interest rate | 1.00% |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  | 0.10% | 0.25% |  |  |  |  |
Promissory note payable period | 2013-11 |  |  |  |  |  |  |  |  |
Imputed interest rate used to discount | 2.00% |  |  |  |  |  |  |  |  |

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