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Debt (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended 37 Months Ended
May 01, 2024
May 03, 2016
Mar. 23, 2016
Oct. 23, 2014
Mar. 20, 2013
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
May 01, 2019
Debt [Line Items]                      
Debt Issuance Costs, Net           $ 18,161,000   $ 18,161,000   $ 18,420,000  
Long-term Line of Credit, Noncurrent           48,607,000   48,607,000   54,425,000  
Loss on redemption of notes           0 $ 0 0 $ (33,298,000)    
Interest Paid               32,324,000 $ 27,979,000    
Letters of Credit Outstanding, Amount           5,009,000   5,009,000      
Outstanding Checks           $ 47,430,000   $ 47,430,000   80,193,000  
Six Point Five Zero Percentage Notes [Domain]                      
Debt [Line Items]                      
Debt Instrument, Face Amount     $ 900,000                
Debt Instrument, Interest Rate, Stated Percentage     6.50%     6.50%   6.50%      
Proceeds from Offering     $ 880,000                
Debt Instrument, Redemption Date, One               May 01, 2019      
Debt Instrument, Redemption Date, Two               May 01, 2020      
Debt Instrument, Percentage Of Redemption Price, Redemption Date Three               101.625%      
Debt Instrument, Redemption Date, Three               May 01, 2021      
Debt Instrument, Redemption Date, Latest For Redemption At Face Amount               May 01, 2022      
Debt Instrument, Percentage Of Redemption Price, Redemption Date One               104.875%      
Debt Instrument, Percentage Of Redemption Price, Redemption Date Two               103.25%      
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount               100.00%      
Debt Instrument, Percentage Redeemable Redemption Date, Additional               106.50%      
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control               101.00%      
Notes due 2024 [Domain]                      
Debt [Line Items]                      
Senior Notes           $ 900,000,000   $ 900,000,000   900,000,000  
Debt Instrument, Interest Rate, Stated Percentage           6.50%   6.50%      
Notes due 2020 [Member]                      
Debt [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage           6.75%   6.75%      
6.75% Notes                      
Debt [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage         6.75%            
Loss on redemption of notes                   $ 33,298  
Debt Instrument, Percentage Of Redemption Price, Redemption Date One     103.375%                
Wells Fargo Capital Finance, LLC                      
Debt [Line Items]                      
Line of Credit Facility, Increase (Decrease), Net       $ 100,000,000              
Long-term Line of Credit         $ 225,000,000            
Debt Instrument, Maturity Date   May 03, 2021   Sep. 30, 2019              
Debt Instrument, Face Amount       $ 325,000,000              
Line of Credit Facility, Description         Dec. 31, 2018            
Wells Fargo Capital Finance, LLC | Base Rate                      
Debt [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage   1.75%   1.00%              
Wells Fargo Capital Finance, LLC | London Interbank Offered Rate (LIBOR)                      
Debt [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage       1.75%              
Wells Fargo Capital Finance, LLC | Non-Prime Rate and Prime Rate on European Advances [Member]                      
Debt [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage   1.50%                  
Wells Fargo Capital Finance, LLC | 6.75% Notes                      
Debt [Line Items]                      
Debt Instrument, Maturity Date     Apr. 01, 2020                
Scenario, Forecast [Member] | Six Point Five Zero Percentage Notes [Domain]                      
Debt [Line Items]                      
Debt Instrument, Maturity Date May 01, 2024                    
Scenario, Forecast [Member] | Wells Fargo Capital Finance, LLC | Six Point Five Zero Percentage Notes [Domain]                      
Debt [Line Items]                      
Debt Instrument, Maturity Date May 01, 2024                    
Scenario, Forecast [Member] | Optional redemption [Domain] | Six Point Five Zero Percentage Notes [Domain]                      
Debt [Line Items]                      
Debt Instrument, Percentage Of Redemption Price Redemption Date, Additional                     35.00%