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Fair Value of Financial Instruments (Tables)
6 Months Ended
Oct. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring Basis The following tables summarize the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of October 31, 2021 and April 30, 2021 (in thousands):
 October 31, 2021
Financial AssetsLevel 1Level 2Total
Trading securities held in non-qualified compensation plans (1)
$1,323 $— $1,323 
Cash surrender value of life insurance policies (1)
— 1,487 1,487 
Total$1,323 $1,487 $2,810 
Financial Liabilities
Non-qualified compensation plans (2)
$— $3,258 $3,258 
Total$— $3,258 $3,258 
 April 30, 2021
Financial AssetsLevel 1Level 2Total
Trading securities held in non-qualified compensation plans (1)
$1,299 $— $1,299 
Cash surrender value of life insurance policies (1)
— 1,458 1,458 
Total$1,299 $1,458 $2,757 
Financial Liabilities
Non-qualified compensation plans (2)
$— $3,169 $3,169 
Total$— $3,169 $3,169 
(1)The Company maintains two non-qualified compensation plans which include investment assets in a rabbi trust. These assets consist of marketable securities, which are valued using quoted market prices multiplied by the number of shares owned, and life insurance policies, which are valued at their cash surrender value.
(2)Plan liabilities are equal to the individual participants' account balances and other earned retirement benefits.