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Revenue Recognition (Tables)
3 Months Ended
Jul. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
A summary of net sales transferred to customers over time and at a point in time for the periods ended July 31, 2021 and July 31, 2020 is as follows (in thousands):
Three Months Ended
 July 31, 2021July 31, 2020
 DomesticInternationalTotalDomesticInternationalTotal
Over Time$28,652 $9,830 $38,482 $29,080 $6,365 $35,445 
Point in Time1,011 — 1,011 978 — 978 
Total$29,663 $9,830 $39,493 $30,058 $6,365 $36,423