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Long-Term Debt Long-Term Debt (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Gross interest expense $ 13,800,000us-gaap_InterestExpenseDebt $ 16,200,000us-gaap_InterestExpenseDebt $ 27,400,000us-gaap_InterestExpenseDebt $ 32,300,000us-gaap_InterestExpenseDebt
Amortization of deferred financing costs 400,000us-gaap_AmortizationOfFinancingCosts 500,000us-gaap_AmortizationOfFinancingCosts 700,000us-gaap_AmortizationOfFinancingCosts 1,000,000us-gaap_AmortizationOfFinancingCosts
Interest costs incurred, capitalized $ 0us-gaap_InterestCostsCapitalized $ 0us-gaap_InterestCostsCapitalized $ 0us-gaap_InterestCostsCapitalized $ 0us-gaap_InterestCostsCapitalized