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Fair Value Measurements Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) - USD ($)
$ in Thousands
May 31, 2018
Feb. 28, 2018
Fair Value Disclosures [Abstract]    
Senior Notes $ 500,000 $ 500,000
Debt Instrument, Fair Value Disclosure $ 486,083 $ 492,163