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Pension and Other Postretirement Benefits Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2020
Apr. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans      
Pension Plan Obligation Decrease for Curtailment $ 6,632,000    
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax   $ 1,592,000  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Voluntary contributions 5,000,000    
Estimated contributions in remainder of current fiscal year     $ 0
Postretirement Health Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Medical Cost Trend Assumption     7.35%
Ultimate Health Care Cost Trend Rate     4.50%
Year that Rate Reaches Ultimate Trend Rate     2038
Supplemental Executive Retirement Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment $ 1,296,000