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Supplemental Information (Tables)
 12 Months Ended
Apr. 30, 2020
Segment Reporting [Abstract]  
Net sales by geography
The following table presents net sales by geography: 
 
2018
 
2019
 
2020
Net sales:
 
 
 
 
 
United States
$
1,529

 
$
1,563

 
$
1,690

United Kingdom
206

 
199

 
180

Germany
146

 
159

 
171

Australia
163

 
164

 
155

Mexico
162

 
166

 
155

Other
1,042

 
1,073

 
1,012

 
$
3,248

 
$
3,324

 
$
3,363