Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 1,046,021	$ 1,032,212	$ 2,018,921	$ 1,956,771
Depreciation and amortization	8,935	9,901	18,203	18,766
Change in fair value of contingent consideration	1,850	6,913	6,434	23,794
Operating income (loss)	29,706	22,341	51,137	29,939
Capital expenditures	4,790	1,985	5,780	3,296
Operating Segments [Member] \| United States and Canada [Member]
Segment Reporting Information [Line Items]
Sales	786,689	764,445	1,532,651	1,458,824
Operating Segments [Member] \| International [Member]
Segment Reporting Information [Line Items]
Sales	266,570	276,918	501,513	514,827
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	869	885	1,790	1,751
Operating income (loss)	(414)	0	(769)	(172)
Capital expenditures	0	699	4	848
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(7,238)	(9,151)	(15,243)	(16,880)
Barcode, Networking & Security Segment [Member]
Segment Reporting Information [Line Items]
Sales	701,639	719,786	1,356,752	1,340,114
Barcode, Networking & Security Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	701,639	719,786	1,356,752	1,340,114
Depreciation and amortization	4,283	4,843	9,016	8,584
Change in fair value of contingent consideration	0	0	0	69
Operating income (loss)	18,581	15,542	32,112	29,578
Capital expenditures	2,784	919	3,740	1,740
Communications & Services Segment [Member]
Segment Reporting Information [Line Items]
Sales	344,382	312,426	662,169	616,657
Communications & Services Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	344,382	312,426	662,169	616,657
Depreciation and amortization	3,783	4,173	7,397	8,431
Change in fair value of contingent consideration	1,850	6,913	6,434	23,725
Operating income (loss)	11,539	6,799	19,794	533
Capital expenditures	$ 2,006	$ 367	$ 2,036	$ 708

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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