Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Sales	$ 972,900	$ 924,559
Depreciation and amortization	9,268	8,864
Change in fair value of contingent consideration	4,584	16,881
Operating income (loss)	21,432	7,598
Capital expenditures	990	1,310
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	745,962	694,379
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	234,943	237,909
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	921	866
Operating income (loss)	(355)	(172)
Capital expenditures	4	149
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(8,005)	(7,729)
Barcode, Networking & Security Segment [Member]
Segment Reporting Information [Line Items]
Sales	655,113	620,329
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	655,113	620,329
Depreciation and amortization	4,733	3,739
Change in fair value of contingent consideration	0	69
Operating income (loss)	13,532	14,035
Capital expenditures	956	820
Communications & Services Segment [Member]
Segment Reporting Information [Line Items]
Sales	317,787	304,230
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	317,787	304,230
Depreciation and amortization	3,614	4,259
Change in fair value of contingent consideration	4,584	16,812
Operating income (loss)	8,255	(6,265)
Capital expenditures	$ 30	$ 341

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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