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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Apr. 30, 2019
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 thousands
 
Cash Flow
Hedges
 
Foreign
Currency
Translation
Adjustment
 
Minimum
Pension
Liability
Adjustment
 
Total
Accumulated
Other
Comprehensive
Income (Loss)
Balance at April 30, 2017
 
(40
)
 
(997
)
 
(5,282
)
 
(6,319
)
Effect of changes in tax rates
 
3

 
—

 
996

 
999

Foreign currency translation adjustment
 
—

 
(430
)
 
—

 
(430
)
Change in fair value of cash flow hedges
 
57

 
—

 
—

 
57

Change in unrecognized actuarial loss on pension obligations
 
—

 
—

 
(586
)
 
(586
)
Income tax effect
 
(23
)
 
—

 
402

 
379

Balance at April 30, 2018
 
(3
)
 
(1,427
)
 
(4,470
)
 
(5,900
)
Effect of changes in tax rates
 
 
 
—

 
67

 
67

Foreign currency translation adjustment
 
—

 
(464
)
 
—

 
(464
)
Change in fair value of cash flow hedges
 
4

 
—

 
—

 
4

Change in unrecognized actuarial loss on pension obligations
 
—

 
—

 
(99
)
 
(99
)
Income tax effect
 
(1
)
 
—

 
(14
)
 
(15
)
Balance at April 30, 2019
 
$
—

 
$
(1,891
)
 
$
(4,516
)
 
$
(6,407
)