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Accrued Liabilities (Restructuring Charges Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Charges (gains)	$ 0	$ 0	$ 17,013	$ 0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period			0
Charges (gains)			17,013
Cash receipts (payments)			(439)
Non-cash activity			0
Restructuring charges, end of period	16,574		16,574
Duarte Relocation Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period			0
Charges (gains)			12,504
Non-cash activity			0
Restructuring charges, end of period	12,504		12,504
Industrial Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period			0
Charges (gains)			4,509
Cash receipts (payments)			(439)
Non-cash activity			0
Restructuring charges, end of period	$ 4,070		$ 4,070