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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Consolidated Balance Sheets    
Trade accounts receivable, allowance for doubtful accounts (in dollars) $ 1,436us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,752us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and equipment, accumulated depreciation (in dollars) 426,957us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 413,208us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Intangible assets, excluding goodwill, accumulated amortization (in dollars) $ 90,470us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 86,320us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, Authorized shares 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 157,650,000us-gaap_CommonStockSharesIssued 155,104,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 157,083,000us-gaap_CommonStockSharesOutstanding 154,668,000us-gaap_CommonStockSharesOutstanding
Preferred stock, par value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, Authorized shares 50,000,000us-gaap_PreferredStockSharesAuthorized 50,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued