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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Oct. 01, 2019	Sep. 30, 2019	Oct. 01, 2018
New Accounting Pronouncements and Changes in Accounting
Adjustment to retained earnings	$ 451,364		$ 599,548
Accounting Standards Update 2014-09
New Accounting Pronouncements and Changes in Accounting
Adjustment to retained earnings				$ (7,000)
Accounting Standards Update 2016-02
New Accounting Pronouncements and Changes in Accounting
Adjustment to retained earnings		$ (87,800)

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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