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Debt - Composition of Long Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Debt Instrument      
Total long-term debt $ 675,000   $ 622,000
Less: unamortized debt issuance costs [1] (3,559)   (2,194)
Less: current maturities (19,986)   (246,893)
Total long-term debt due after one year $ 651,455   372,913
Senior Notes | 4.12%, due September 2046      
Debt Instrument      
Interest rate 4.12%    
Total long-term debt $ 200,000   $ 0
Senior Notes | 5.75%, due September 2016      
Debt Instrument      
Interest rate     5.75%
Total long-term debt $ 0   $ 175,000
Senior Notes | 4.98%, due March 2044      
Debt Instrument      
Interest rate 4.98%   4.98%
Total long-term debt $ 175,000   $ 175,000
Senior Notes | 2.95%, due June 2026      
Debt Instrument      
Interest rate 2.95% 2.95%  
Total long-term debt $ 100,000   $ 0
Senior Notes | 6.21%, due September 2036      
Debt Instrument      
Interest rate 6.21%   6.21%
Total long-term debt $ 100,000   $ 100,000
Medium-Term Notes | 7.37%, due October 2015      
Debt Instrument      
Interest rate     7.37%
Total long-term debt 0   $ 22,000
Medium-Term Notes | 5.64%, due December 2015      
Debt Instrument      
Interest rate     5.64%
Total long-term debt $ 0   $ 50,000
Medium-Term Notes | 6.17%, due June 2017      
Debt Instrument      
Interest rate 6.17%   6.17%
Total long-term debt $ 20,000   $ 20,000
Medium-Term Notes | 7.25%, due November 2017      
Debt Instrument      
Interest rate 7.25%   7.25%
Total long-term debt $ 20,000   $ 20,000
Medium-Term Notes | 5.67%, due January 2018      
Debt Instrument      
Interest rate 5.67%   5.67%
Total long-term debt $ 20,000   $ 20,000
Medium-Term Notes | 6.50%, due August 2033      
Debt Instrument      
Interest rate 6.50%   6.50%
Total long-term debt $ 20,000   $ 20,000
Medium-Term Notes | 6.13%, due October 2034      
Debt Instrument      
Interest rate 6.13%   6.13%
Total long-term debt $ 20,000   $ 20,000
[1] Prior-year amounts reflect the retrospective impact from the adoption of new accounting guidance regarding the classification of debt issuance costs (see Note 3).