Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Narrative (Details)

v3.19.2
Organization and Basis of Presentation - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 752,370 $ 666,210 $ 633,281
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 35,483 $ 32,929