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Note 7. Employee Benefit Plans - Retirement Plans Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Domestic Plans
Employer's contribution to retirement plans	$ 1.5	$ 1.3	$ 1.2
Foreign Plans
Employer's contribution to retirement plans	$ 0.2	$ 0.2	$ 0.2

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 70



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=ke_DomesticPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=ke_ForeignPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: