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Fair Value Measurement (Narrative) (Details) (USD $)
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Nov. 30, 2011
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Aug. 31, 2011
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Nov. 30, 2003
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|---|---|---|---|
| Fair Value Measurement [Line Items] | |||
| Outstanding debt, amount | $ 162,700,000 | $ 158,000,000 | |
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Senior Credit Facility - Revolver [Member]
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| Fair Value Measurement [Line Items] | |||
| Outstanding debt, amount | 62,700,000 | 58,000,000 | |
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Senior Credit Facility - Term Loan [Member]
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| Fair Value Measurement [Line Items] | |||
| Outstanding debt, amount | 100,000,000 | 100,000,000 | |
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2% Convertible Notes [Member]
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| Fair Value Measurement [Line Items] | |||
| Outstanding debt, amount | 117,600,000 | ||
| Fair value of long-term debt | 141,400,000 | 127,900,000 | |
| Interest rate on Convertible Notes | 2.00% | 2.00% | |
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Senior Notes [Member]
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| Fair Value Measurement [Line Items] | |||
| Outstanding debt, amount | 250,000,000 | ||
| Fair value of long-term debt | $ 255,000,000 | $ 252,500,000 |