Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 1,006,927	$ 972,900
Depreciation and amortization	9,189	9,268
Change in fair value of contingent consideration	2,472	4,584
Operating income (loss)	18,605	21,432
Capital expenditures	940	990
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	778,518	745,962
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	237,467	234,943
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	1,008	921
Operating income (loss)	(757)	(355)
Capital expenditures	0	4
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(9,058)	(8,005)
Barcode, Networking & Security Segment [Member]
Segment Reporting Information [Line Items]
Sales	697,791	655,113
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	697,791	655,113
Depreciation and amortization	4,287	4,733
Change in fair value of contingent consideration	0	0
Operating income (loss)	11,992	13,532
Capital expenditures	531	956
Communications & Services Segment [Member]
Segment Reporting Information [Line Items]
Sales	309,136	317,787
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	309,136	317,787
Depreciation and amortization	3,894	3,614
Change in fair value of contingent consideration	2,472	4,584
Operating income (loss)	7,370	8,255
Capital expenditures	$ 409	$ 30

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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