Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
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