For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair Value of Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	$ 42,975,000	$ 38,393,000	$ 42,975,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration		(15,200,000)	(37,043,000)
Fair value of liability for contingent consideration	108,233,000	77,925,000	108,233,000	$ 114,036,000
Worldwide Communications and Services Segment [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration		(15,200,000)	(36,974,000)
Fair value of liability for contingent consideration	108,233,000	77,925,000	108,233,000	114,036,000
Worldwide Communications and Services Segment [Member] \| Network1 [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration		(2,500,000)	(21,000,000.0)
Fair value of liability for contingent consideration	10,700,000	0	10,700,000
Worldwide Communications and Services Segment [Member] \| Intelisys [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration		(12,700,000)	(16,000,000.0)
Fair value of liability for contingent consideration	97,500,000	77,900,000	97,500,000
Current portion of contingent consideration	32,200,000	38,400,000	32,200,000
Undiscounted contingent consideration payments, maximum		85,100,000
Worldwide Barcode, Networking and Security Segment [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration		0	(69,000)
Fair value of liability for contingent consideration	0	$ 0	$ 0	$ 0
Worldwide Barcode, Networking and Security Segment [Member] \| POS Portal [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) due to change in fair value of contingent consideration	$ (100,000)