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Credit Arrangements (Narrative) (Details) | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2012 USD ($) | Aug. 31, 2011 USD ($) | Aug. 31, 2010 USD ($) | Aug. 31, 2012 Euro Line Of Credit [Member] EUR (€) | Aug. 31, 2011 Euro Line Of Credit [Member] EUR (€) | Aug. 31, 2012 Wells Fargo Bank NA (Revolving Credit Agreement)[Member] | Aug. 31, 2012 Wells Fargo Bank N.A. (B S I Term Note) [Member] USD ($) | Jun. 03, 2006 Wells Fargo Bank N.A. (B S I Term Note) [Member] | Jun. 01, 2006 Wells Fargo Bank N.A. (B S I Term Note) [Member] | Jun. 06, 2006 Line of Credit [Member] Wells Fargo Bank N.A. (B S I Term Note) [Member] USD ($) | Aug. 31, 2012 Revolving Credit Facility [Member] Wells Fargo Bank NA (Revolving Credit Agreement)[Member] | Jan. 23, 2011 Revolving Credit Facility [Member] Wells Fargo Bank NA (Revolving Credit Agreement)[Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving line of credit, maximum borrowing capacity |  |  |  | € 2,300,000 |  |  |  |  |  |  |  |
Unsecured revolving line of credit, amount outstanding |  |  |  | 0 | 0 |  |  |  |  |  |  |
Basis points |  |  |  | 1.10% |  |  |  | 0.50% |  |  | 1.05% |
Interest rate |  |  |  | 1.38% |  | 1.28% | 0.65% |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  |  | 6.05% |  |  |
Maturity date |  |  |  | Jan. 31, 2013 |  |  |  |  |  |  |  |
Interest expense | 492,000 | 762,000 | 1,557,000 |  |  |  |  |  |  |  |  |
Unsecured term note and credit agreement |  |  |  |  |  |  |  |  |  | 30,000,000 |  | 30,000,000
Principal payment |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |
Line of Credit Facility, Frequency of Payments |  |  |  |  |  |  | quarterly |  |  |  |  |
Annual commitment fee | 0.25% |  |  |  |  |  |  |  |  |  |  |

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