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GENERAL AND ADMINISTRATIVE EXPENSES - Additional Information (Details) - USD ($)	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
GENERAL AND ADMINISTRATIVE EXPENSES
Non-cash pre-tax pension settlement charge	$ 0	$ 2,929,000
Lump sum payouts of pension benefits to former employees		$ 7,280,000

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- References

No definition available.

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- Definition

Amount of cost (reversal of cost) for pension and other postretirement benefits.

+ References

No definition available.

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- Definition

Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

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