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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Oct. 31, 2018	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Reduction of tax expense	$ 2,000	$ 2,000

X

- Definition

Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

+ Details

Name:	kequ_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit
Namespace Prefix:	kequ_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration