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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]      
Long-term Debt   $ 1,092,397 $ 580,286
Unamortized debt issuance costs   (2,895) (1,794)
Current portion of long-term debt   0 0
Long-term debt, excluding current portion   $ 1,092,397 $ 580,286
Series P Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.27%  
Maturity date   May 30, 2025  
Long-term Debt   $ 85,000  
Series R Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.41%  
Maturity date   May 30, 2029  
Long-term Debt   $ 75,000  
Series S Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.46%  
Maturity date   May 30, 2030  
Long-term Debt   $ 75,000  
Series T Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.61%  
Maturity date   May 30, 2033  
Long-term Debt   $ 80,000  
Series D Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   6.39% 6.39%
Maturity date   Oct. 01, 2018 Oct. 01, 2018
Long-term Debt   $ 100,000 $ 100,000
Series F Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   8.24% 8.24%
Maturity date   Apr. 03, 2019 Apr. 03, 2019
Long-term Debt   $ 43,000 $ 43,000
Series J Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Variable Rate Basis   1.25% 1.25%
Maturity date   Nov. 15, 2020 Nov. 15, 2020
Long-term Debt   $ 50,000 $ 50,000
Series G Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   3.42% 3.42%
Maturity date   Nov. 15, 2020 Nov. 15, 2020
Long-term Debt   $ 50,000 $ 50,000
Series H Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.03% 4.03%
Maturity date   Nov. 15, 2023 Nov. 15, 2023
Long-term Debt   $ 25,000 $ 25,000
Series I Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.18% 4.18%
Maturity date   Nov. 15, 2025 Nov. 15, 2025
Long-term Debt   $ 25,000 $ 25,000
Series K Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.03% 4.03%
Maturity date   Nov. 15, 2023 Nov. 15, 2023
Long-term Debt   $ 50,000 $ 50,000
Series L Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.18% 4.18%
Maturity date   Nov. 15, 2025 Nov. 15, 2025
Long-term Debt   $ 50,000 $ 50,000
Series M Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   1.12% 1.12%
Maturity date   Sep. 23, 2026 Sep. 23, 2026
Long-term Debt   $ 46,437 $ 47,270
Series N Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   1.31% 1.31%
Maturity date   Sep. 23, 2028 Sep. 23, 2028
Long-term Debt   $ 89,393 $ 90,995
Series O Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   1.57% 1.57%
Maturity date   Sep. 23, 2031 Sep. 23, 2031
Long-term Debt   $ 49,921 $ 50,815
Series Q Notes [Member] | Notes Payable to Banks [Member]      
Debt Instrument [Line Items]      
Interest rate   4.35%  
Maturity date   May 30, 2027  
Long-term Debt   $ 85,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt   $ 116,541  
Revolving Credit Agreement [Member]      
Debt Instrument [Line Items]      
Variable Rate Basis LIBOR