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Unaudited Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
ASSETS    
Cash $ 90,234us-gaap_CashAndCashEquivalentsAtCarryingValue $ 80,080us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 226,695us-gaap_AccountsReceivableNetCurrent 242,684us-gaap_AccountsReceivableNetCurrent
Income tax receivable 9,864us-gaap_IncomeTaxesReceivable 6,260us-gaap_IncomeTaxesReceivable
Inventories of materials and supplies 134,415us-gaap_InventoryNet 132,368us-gaap_InventoryNet
Prepaid expenses, deferred costs and other current assets 28,069atw_PrepaidExpensesandDeferredCostsCurrent 36,415atw_PrepaidExpensesandDeferredCostsCurrent
Total current assets 489,277us-gaap_AssetsCurrent 497,807us-gaap_AssetsCurrent
Property and equipment, net 4,010,691us-gaap_PropertyPlantAndEquipmentNet 3,967,028us-gaap_PropertyPlantAndEquipmentNet
Other receivables 11,831us-gaap_AccountsReceivableNetNoncurrent 11,831us-gaap_AccountsReceivableNetNoncurrent
Deferred income taxes 166us-gaap_DeferredTaxAssetsNetNoncurrent 589us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred costs and other assets 24,317atw_DeferredCostsandOtherAssetsNoncurrent 29,973atw_DeferredCostsandOtherAssetsNoncurrent
Total assets 4,536,282us-gaap_Assets 4,507,228us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY    
Accounts payable 106,150us-gaap_AccountsPayableCurrent 94,315us-gaap_AccountsPayableCurrent
Accrued liabilities 20,194us-gaap_AccruedLiabilitiesCurrent 19,158us-gaap_AccruedLiabilitiesCurrent
Dividends Payable 16,161us-gaap_DividendsPayableCurrentAndNoncurrent 16,090us-gaap_DividendsPayableCurrentAndNoncurrent
Short-term debt 0us-gaap_NotesPayableCurrent 11,885us-gaap_NotesPayableCurrent
Interest payable 8,424us-gaap_InterestPayableCurrent 8,099us-gaap_InterestPayableCurrent
Income tax payable 13,924us-gaap_AccruedIncomeTaxesCurrent 14,234us-gaap_AccruedIncomeTaxesCurrent
Deferred credits and other liabilities 4,145us-gaap_DeferredRevenueAndCreditsCurrent 3,596us-gaap_DeferredRevenueAndCreditsCurrent
Total current liabilities 168,998us-gaap_LiabilitiesCurrent 167,377us-gaap_LiabilitiesCurrent
LONG TERM LIABILITIES:    
Long-term debt 1,606,542us-gaap_LongTermDebtNoncurrent 1,742,122us-gaap_LongTermDebtNoncurrent
Deferred income taxes 822us-gaap_DeferredTaxLiabilitiesNoncurrent 783us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred credits 4,532us-gaap_DeferredRevenueAndCreditsNoncurrent 4,100us-gaap_DeferredRevenueAndCreditsNoncurrent
Other 37,439us-gaap_OtherLiabilitiesNoncurrent 37,322us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 1,649,335us-gaap_LiabilitiesNoncurrent 1,784,327us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 8)      
Shareholders’ equity:    
Preferred stock, no par value, 1,000 shares authorized, none outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $1.00 par value, 180,000 shares authorized with 64,644 issued and outstanding at March 31, 2015 and 180,000 shares authorized and 64,362 shares issued and outstanding at September 30, 2014 64,644us-gaap_CommonStockValue 64,362us-gaap_CommonStockValue
Paid-in capital 208,264us-gaap_AdditionalPaidInCapital 201,464us-gaap_AdditionalPaidInCapital
Retained earnings 2,438,790us-gaap_RetainedEarningsAccumulatedDeficit 2,286,137us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 6,251us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 3,561us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders' equity 2,717,949us-gaap_StockholdersEquity 2,555,524us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 4,536,282us-gaap_LiabilitiesAndStockholdersEquity $ 4,507,228us-gaap_LiabilitiesAndStockholdersEquity