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Fair Value Measurements (Tables)
12 Months Ended
Apr. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Of Assets On Recurring Basis The following table summarizes the fair value of assets and liabilities that are recorded in the Company's consolidated financial statements as of April 30, 2021 and 2020 at fair value on a recurring basis: 
 FAIR VALUE MEASUREMENTS AS OF APRIL 30, 2021
(in thousands)LEVEL 1LEVEL 2LEVEL 3
ASSETS:   
Mutual funds$642 $— $— 
 FAIR VALUE MEASUREMENTS AS OF APRIL 30, 2020
(in thousands)LEVEL 1LEVEL 2LEVEL 3
ASSETS:   
Mutual funds$773 $— $— 
LIABILITIES:
Foreign exchange forward contracts$— $(1,102)$—