Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2020 USD ($) segment	Sep. 30, 2020 USD ($)	Jul. 01, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment	2
Adjustment to retained earnings	$ 2,864,984	$ 2,678,860		$ 2,497,027	$ 2,258,106	$ 2,117,251	$ 2,072,193
Retained Earnings [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings	$ 3,076,569	2,953,709		$ 2,832,991	$ 2,604,910	$ 2,500,506	$ 2,436,410
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue recognized, term	1 year
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue recognized, term	5 years
Cumulative Effect Of Change In Accounting Standards [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings		(1,143)
Cumulative Effect Of Change In Accounting Standards [Member] | Retained Earnings [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings		$ (1,143)
Cumulative Effect Of Change In Accounting Standards [Member] | Accounting Standards Update 2016-13 [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment to retained earnings			$ 1,100