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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019	Oct. 01, 2018
New Accounting Pronouncements and Changes in Accounting
Retained earnings	$ 174,248		$ 599,548
ASU 2014-09
New Accounting Pronouncements and Changes in Accounting
Retained earnings				$ 7,000
ASU 2016-02
New Accounting Pronouncements and Changes in Accounting
Retained earnings		$ 87,800

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