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Business and Summary of Significant Accounting Policies (Narrative) (Details)		12 Months Ended
	Aug. 31, 2016 USD ($)	Jun. 30, 2019 USD ($) product_line earnout_payment segment	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jul. 01, 2019 USD ($)
Number of reportable segments \| segment		2
Amount of related party transactions		$ 0	$ 0	$ 0
Cash and cash equivalents		$ 23,818,000	25,530,000
Derivative contract term		90 days
Deferred compensation plan assets		$ 25,787,000	23,352,000
Portion of investment obligation in current liabilities		$ 1,600,000	1,600,000
Number of product lines with warranty programs \| product_line		3
Product warranty term		30 days
Goodwill impairment		$ 0	0	0
Impairment of long-lived assets		$ 0	$ 0	$ 0
Period in force for stock repurchase program	3 years
Value of stock repurchase program approval	$ 120,000,000
Building Improvements [Member]
Property and equipment, estimated useful life (years)		15 years
Minimum [Member] \| Furniture [Member]
Property and equipment, estimated useful life (years)		3 years
Minimum [Member] \| Buildings [Member]
Property and equipment, estimated useful life (years)		25 years
Minimum [Member] \| Customer Relationships [Member]
Intangible assets, estimated useful life (years)		5 years
Minimum [Member] \| Trade Names [Member]
Intangible assets, estimated useful life (years)		1 year
Maximum [Member] \| Furniture [Member]
Property and equipment, estimated useful life (years)		10 years
Maximum [Member] \| Buildings [Member]
Property and equipment, estimated useful life (years)		40 years
Maximum [Member] \| Customer Relationships [Member]
Intangible assets, estimated useful life (years)		15 years
Maximum [Member] \| Trade Names [Member]
Intangible assets, estimated useful life (years)		5 years
Customer Concentration Risk [Member] \| Maximum [Member]
Concentration risk percentage		5.00%	6.00%	5.00%
Supplier Concentration Risk [Member] \| Minimum [Member]
Concentration risk percentage		10.00%	10.00%	10.00%
International [Member]
Cash and cash equivalents		$ 18,900,000	$ 20,300,000
Bank Overdrafts [Member]
Outstanding checks		$ 25,400,000	5,700,000
Intelisys [Member]
Number of remaining earnout payments \| earnout_payment		2
Interest Rate Swap [Member]
Ineffective portion of cash flow hedge		$ 0	$ 0
Accounting Standards Update 2018-15
Capitalized software costs		$ 5,400,000
Forecast [Member] \| Accounting Standards Update 2016-02 [Member]
Operating lease, right-of-use asset					$ 35,000,000
Operating lease, liability					$ 45,000,000