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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Schedule of assets and liabilities measured at fair value on recurring basis |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 50 |
Interest Rate Derivative Liabilities, at Fair Value Disclosure | 376 | 542
Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |
Interest Rate Derivative Liabilities, at Fair Value Disclosure | 0 | 0
Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 50 |
Interest Rate Derivative Liabilities, at Fair Value Disclosure | 376 | 542
Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |
Interest Rate Derivative Liabilities, at Fair Value Disclosure | 0 | 0
Money market mutual funds [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 18,153 | 9,921
Money market mutual funds [Member] | Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 18,153 | 9,921
Money market mutual funds [Member] | Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Money market mutual funds [Member] | Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Government agency bonds [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 9,529 | 6,817
Government agency bonds [Member] | Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 9,529 | 6,817
Government agency bonds [Member] | Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Government agency bonds [Member] | Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
United States treasuries [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 10,061 | 6,089
United States treasuries [Member] | Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 10,061 | 6,089
United States treasuries [Member] | Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
United States treasuries [Member] | Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Corporate notes [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 8,052 | 4,679
Corporate notes [Member] | Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 8,052 | 4,679
Corporate notes [Member] | Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Corporate notes [Member] | Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Certificates of deposit [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 2,569 | 1,800
Certificates of deposit [Member] | Level 1 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 2,569 | 1,800
Certificates of deposit [Member] | Level 2 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Certificates of deposit [Member] | Level 3 [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | $ 0 | $ 0

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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