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Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis (Parenthetical) (Detail)	Jul. 31, 2017 CompensationPlan
Regulatory Assets [Abstract]
Number of non-qualified compensation plans maintained	2

X

- Definition

Number of nonqualified compensation plans.

+ References

No definition available.

+ Details

Name:	kequ_NumberOfNonqualifiedCompensationPlans
Namespace Prefix:	kequ_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Regulatory Assets [Abstract]

+ References

No definition available.

+ Details

Name:	kequ_RegulatoryAssetsAbstract
Namespace Prefix:	kequ_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration