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Long-Term Debt Long-Term Debt (Narrative) (Details) (USD $) | 3 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Gross interest expense | $ 8,400,000 | $ 8,400,000
Amortization of deferred financing costs | 500,000 | 500,000
Interest costs incurred, capitalized | $ 0 | $ 100,000

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