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Fair Value Measurements of Other Financial Instruments (Details) (USD $)
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Apr. 30, 2013
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Oct. 31, 2012
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|---|---|---|
| Carrying And Fair Value [Line Items] | ||
| Carrying value of other investments | $ 7,470,000 | $ 7,470,000 |
| Carrying value of debt | 500,000,000 | 500,000,000 |
| Carrying value of non-controlling capital interest in ACM Holdings | 6,600,000 | 6,600,000 |
| Carrying value of other assets related to Hexavest option | 8,254,000 | 8,307,000 |
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Level 2 [Member]
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| Carrying And Fair Value [Line Items] | ||
| Fair value of debt | 602,672,000 | 604,316,000 |
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Level 3 [Member]
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| Carrying And Fair Value [Line Items] | ||
| Fair value of other investments | 7,470,000 | 7,470,000 |
| Fair value of non-controlling capital interest in ACM Holdings | 6,600,000 | 6,600,000 |
| Fair value of other assets related to Hexavest option | $ 8,254,000 | $ 8,307,000 |