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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 18,957 $ (17,363) $ 168,588 $ 106,272
Other comprehensive income (loss), net of tax        
Unrealized (loss) gain on available for sale securities, net of tax of $2,375, $3,754, $(2,081), and $(2,014), respectively (3,622) (5,313) 3,301 2,888
Net unrealized (loss) on derivatives, net of tax of $0, $2, $0 and $0, respectively [1] 0 (5) 0 0
Adjustment to postemployment benefit obligation, net of tax of $(217), $(174), $(651), and $(523) respectively 318 256 953 769
Other comprehensive (loss) income (3,304) (5,062) 4,254 3,657
Comprehensive income (loss) $ 15,653 $ (22,425) $ 172,842 $ 109,929
[1] Effective January 1, 2016, the Company elected not to designate its foreign currency derivatives as accounting hedges and, as a result, changes in fair value of the effective portion of the hedges are no longer recorded in OCI. See Note 4 Derivative Instruments for more information on these transactions.