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Long-Term Debt - Canadian Revolving Credit Facility (Details)
$ in Thousands, $ in Millions
3 Months Ended
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Jun. 01, 2018
USD ($)
Jun. 01, 2018
CAD ($)
Debt Instrument [Line Items]        
Net repayments $ 58,083 $ 262,107    
Net borrowings 14,421 $ 274,810    
Canadian Facility        
Debt Instrument [Line Items]        
Maximum amount under the facility     $ 22,400 $ 30.0
Net repayments 3,700      
Available borrowings under the facility $ 18,600