Note 18. Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)			$ 16,600
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit), Per Share			$ 0.62
Net Sales	$ 276,768	$ 283,938	$ 258,151		$ 253,204	$ 241,268	$ 232,930	$ 230,265	$ 226,451		$ 1,072,061	$ 930,914	$ 842,060
Gross Profit	22,823	22,927	20,962		19,490	18,002	18,718	20,553	18,322		86,202	75,595	64,538
Other General Income						0	0	0	(4,005)	[1]	0	(4,005)	0
Net Income (Loss)	$ 5,784	$ 10,835	$ (8,347)	[2]	$ 8,480	$ 8,128	$ 8,117	$ 7,812	$ 10,122		$ 16,752	$ 34,179	$ 22,287
Earnings Per Share, Basic	$ 0.22	$ 0.41	$ (0.31)		$ 0.32	$ 0.30	$ 0.30	$ 0.29	$ 0.36		$ 0.63	$ 1.25	$ 0.77
Earnings Per Share, Diluted	$ 0.22	$ 0.40	$ (0.31)		$ 0.31	$ 0.30	$ 0.30	$ 0.28	$ 0.36		$ 0.62	$ 1.24	$ 0.76

[1] Other General Income of $4.0 million resulted from a payment received related to a class action lawsuit in which Kimball Electronics was a class member.

[2] Net income for the quarter ended December 31, 2017 included income tax expense of $16.6 million ($0.62 per diluted share) due to the U.S. Tax Cuts and Jobs Act (“Tax Reform”) that was enacted into law in December 2017 and relates to the deemed repatriation of unremitted foreign earnings and the revaluation of net deferred tax assets.