Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 895,637	$ 813,538	$ 2,852,408	$ 2,650,895
Depreciation and amortization	9,438	6,880	28,204	18,692
Change in fair value of contingent consideration	4,801	1,960	28,595	3,921
Operating income	17,941	19,978	47,880	66,128
Capital expenditures	2,011	3,185	5,307	6,445
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	660,139	619,590	2,118,963	2,016,561
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	242,243	200,382	757,070	660,124
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	868	870	2,619	2,507
Operating income	0	0	(172)	(833)
Capital expenditures	189	1,098	1,037	1,890
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(6,745)	(6,434)	(23,625)	(25,790)
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	604,322	548,971	1,944,436	1,770,015
Depreciation and amortization	4,830	1,828	13,413	5,183
Change in fair value of contingent consideration	0	0	69	0
Operating income	11,566	11,175	41,143	36,729
Capital expenditures	1,293	1,144	3,033	2,522
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	291,315	264,567	907,972	880,880
Depreciation and amortization	3,740	4,182	12,172	11,002
Change in fair value of contingent consideration	4,801	1,960	28,526	3,921
Operating income	6,375	8,803	6,909	30,232
Capital expenditures	$ 529	$ 943	$ 1,237	$ 2,033

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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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
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