Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
U.S. statutory rate		28.00%	35.00%	35.00%
Provisional income tax expense for one-time transition tax			$ 0	$ 0
Valuation allowance, amount	$ 3,473	$ 5,098	3,473
Net tax expense due to stock award settlements		1,000
Gross unrecognized tax benefits	2,176	2,053	2,176	2,148	$ 1,301
Unrecognized tax benefits that would impact effective tax rate if recognized		1,400
Unrecognized tax benefits, period increase		100
Income tax penalties and interest accrued	1,100	1,200	1,100	1,200
Income (loss) before income taxes		60,925	101,495	96,010
Domestic Tax Authority [Member]
Operating loss carry forwards		2,400
State and Local [Member]
Operating loss carry forwards		4,100
Tax credit carry forwards		2,200
Operating loss carry forwards, valuation allowance		100
Valuation allowance, amount		300
Foreign [Member]
Operating loss carry forwards		17,800
Tax credit carry forwards		600
Operating loss carry forwards, valuation allowance		600
Valuation allowance, amount		600
Withholding Tax Credits [Member]
Tax credit carry forwards		3,500
Valuation allowance, amount		3,500
Notional Interest Deduction [Member]
Valuation allowance, amount		$ 100
Minimum [Member]
Open tax year		2013
ScanSource Europe SPRL [Member]
Income (loss) before income taxes		$ (5,300)
ScanSource Brazil [Member]
Provision for income taxes	$ 4,500
Internal Revenue Service (IRS) [Member]
Provisional income tax expense for one-time transition tax		9,609
Provisional income tax benefit due to the remeasurement of net deferred tax liabilities		(1,615)	0	0
Administration of the Treasury, Belgium [Member]
Provisional income tax benefit due to the remeasurement of net deferred tax liabilities		$ 1,040	$ 0	$ 0