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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting
Other non-current assets	$ 206,401		$ 228,682
Retained earnings	$ 1,088,824		$ 948,148
Accounting Standards Update 2014-09
New Accounting Pronouncements and Changes in Accounting
Retained earnings		$ 7,000
Accounting Standards Update 2016-16
New Accounting Pronouncements and Changes in Accounting
Other non-current assets		(5,500)
Retained earnings		$ 5,500

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