Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Sales	$ 893,357	$ 895,637	$ 2,912,278	$ 2,852,408
Depreciation and amortization	9,363	9,438	27,566	28,204
Change in fair value of contingent consideration	5,101	4,801	11,535	28,595
Operating income (loss)	18,804	17,941	69,942	47,880
Capital expenditures	5,197	2,011	10,977	5,307
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	678,078	660,139	2,210,729	2,118,963
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	221,202	242,243	722,715	757,070
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	895	868	2,685	2,619
Operating income (loss)	(222)	0	(988)	(172)
Capital expenditures	0	189	4	1,037
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(5,923)	(6,475)	(21,166)	(23,625)
Barcode, Networking & Security Segment [Member]
Segment Reporting Information [Line Items]
Sales	596,913	604,322	1,953,664	1,944,436
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	596,913	604,322	1,953,664	1,944,436
Depreciation and amortization	4,371	4,830	13,387	13,413
Change in fair value of contingent consideration	0	0	0	69
Operating income (loss)	16,865	11,566	48,974	41,143
Capital expenditures	2,298	1,293	6,038	3,033
Communications & Services Segment [Member]
Segment Reporting Information [Line Items]
Sales	296,444	291,315	958,614	907,972
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	296,444	291,315	958,614	907,972
Depreciation and amortization	4,097	3,740	11,494	12,172
Change in fair value of contingent consideration	5,101	4,801	11,535	28,526
Operating income (loss)	2,161	6,375	21,956	6,909
Capital expenditures	$ 2,899	$ 529	$ 4,935	$ 1,237

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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