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Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Apr. 30, 2021
Equity [Abstract]  
Schedule of Before Tax Income (Loss) Related Income Tax Effect and Accumulated Balances The before tax income (loss), related income tax effect, and accumulated balances are as follows:
$ in thousandsCash Flow
Hedges
Foreign
Currency
Translation
Adjustment
Minimum
Pension
Liability
Adjustment
Total
Accumulated
Other
Comprehensive
Income (Loss)
Balance at April 30, 2019$— $(1,891)$(4,516)$(6,407)
Foreign currency translation adjustment— (444)— (444)
Change in fair value of cash flow hedges— — 
Change in unrecognized actuarial loss on pension obligations— — (3,592)(3,592)
Income tax effect(1)844 844 
Balance at April 30, 2020— (2,334)(7,264)(9,598)
Foreign currency translation adjustment (23) (23)
Change in unrecognized actuarial loss on pension obligations  6,044 6,044 
Balance at April 30, 2021$ $(2,357)$(1,220)$(3,577)