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Derivative Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2020
Apr. 30, 2015
Derivative Financial Instruments (Textual) [Abstract]        
Amortization of deferred gain on early termination agreement $ 2.2 $ 2.0    
Cash margin accounts related to derivative instruments recognized 15.6   $ 43.2  
Interest expense – net (46.1) $ (49.4)    
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses) $ (16.7)   (32.9)  
Commodity contracts        
Derivative Financial Instruments (Textual) [Abstract]        
Derivative instrument maturity 1 year      
Foreign currency exchange contracts        
Derivative Financial Instruments (Textual) [Abstract]        
Derivative instrument maturity 1 year      
Interest rate contracts        
Derivative Financial Instruments (Textual) [Abstract]        
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss     (239.8)  
Deferred pre-tax gain (loss) included in accumulated other comprehensive loss $ (237.7)   (241.1)  
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss 54.7   $ 55.5  
Effective portion of the hedge loss reclassified to interest expense over the next twelve months (13.9)      
Total Through Q1 2021 [Member]        
Derivative Financial Instruments (Textual) [Abstract]        
Amortization of deferred gain on early termination agreement 43.3      
2021 [Member]        
Derivative Financial Instruments (Textual) [Abstract]        
Amortization of deferred gain on early termination agreement 6.2      
2022 [Member]        
Derivative Financial Instruments (Textual) [Abstract]        
Amortization of deferred gain on early termination agreement $ 4.0      
Cash [Member] | Interest rate swap | Fair Value Hedging [Member]        
Derivative Financial Instruments (Textual) [Abstract]        
Gain (loss) on early termination agreement       $ 58.1
Accrued and Prepaid Interest, Net [Member] | Interest rate swap | Fair Value Hedging [Member]        
Derivative Financial Instruments (Textual) [Abstract]        
Gain (loss) on early termination agreement       $ 4.6