Business, Basis of Presentation and Summary of Significant Accounting Policies - Business and Reclassification (Details) $ in Thousands	Apr. 30, 2021 USD ($) center	Apr. 30, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of branches through which products are distributed | center	268
Reclassification [Line Items]
Other liabilities	$ (63,508)	$ (66,512)
Other accrued expenses and current liabilities	$ 87,138	75,326
Revision of Prior Period, Error Correction, Adjustment
Reclassification [Line Items]
Other liabilities		11,500
Other accrued expenses and current liabilities		$ 11,500