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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]    
Income from continuing operations $ 114,038 $ 101,546
Income allocated to participating securities 153 170
Income from continuing operations available to common shareholders $ 113,885 $ 101,376
Income (Loss) from Continuing Operations, Per Basic and Diluted Share $ 1.08 $ 0.99
Income from discontinued operations, net of tax $ 10,994 $ 1,315
Undistributed Earnings From Discontinued Operations Allocated To Participating Securities 14 1
Income from discontinued operations available to common shareholders $ 10,980 $ 1,314
Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share $ 0.11 $ 0.01
Basic and diluted net income per share $ 1.19 $ 1.00
Weighted Average Number of Shares Outstanding, Basic and Diluted 105,284 102,713