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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting
Other non-current assets	$ 208,692		$ 228,682
Retained earnings	599,548		$ 948,148
ASU 2014-09
New Accounting Pronouncements and Changes in Accounting
Retained earnings		$ (7,000)
ASU 2016-02
New Accounting Pronouncements and Changes in Accounting
Leased assets	700,000
Lease liabilities	1,000,000
ASU 2016-16
New Accounting Pronouncements and Changes in Accounting
Other non-current assets		(5,500)
Retained earnings	$ 100,000	$ (5,500)

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