Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 1,032,212	$ 904,792	$ 1,956,771	$ 1,837,357
Depreciation and amortization	9,901	6,588	18,766	11,812
Change in fair value of contingent consideration	6,913	1,791	23,794	1,961
Operating income	22,341	23,275	29,939	46,150
Capital expenditures	1,985	1,285	3,296	3,261
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	764,445	676,600	1,458,824	1,396,971
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	276,918	236,977	514,827	459,742
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	885	819	1,751	1,637
Operating income	0	(335)	(172)	(833)
Capital expenditures	699	286	848	792
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(9,151)	(8,785)	(16,880)	(19,356)
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	719,786	593,833	1,340,114	1,221,043
Depreciation and amortization	4,843	1,718	8,584	3,355
Change in fair value of contingent consideration	0	0	69	0
Operating income	15,542	12,131	29,578	25,554
Capital expenditures	919	523	1,740	1,378
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	312,426	310,959	616,657	616,314
Depreciation and amortization	4,173	4,051	8,431	6,820
Change in fair value of contingent consideration	6,913	1,791	23,725	1,961
Operating income	6,799	11,479	533	21,429
Capital expenditures	$ 367	$ 476	$ 708	$ 1,091

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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