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Fair Value Measurements (Tables)
12 Months Ended
Apr. 30, 2022
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, 2022 and 2021 at fair value on a recurring basis (in thousands): 
 FAIR VALUE MEASUREMENTS AS OF APRIL 30, 2022
LEVEL 1LEVEL 2LEVEL 3
ASSETS:   
Mutual funds$404 $— $— 
Interest rate swap contracts— 13,687 — 
Total assets at fair value$404 $13,687 $— 
 FAIR VALUE MEASUREMENTS AS OF APRIL 30, 2021
LEVEL 1LEVEL 2LEVEL 3
ASSETS:   
Mutual funds$642 $— $—