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Accrued Liabilities (Changes in Restructuring Reserve Activity) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Charges (gains)			$ 17,013
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period		$ 16,522
Charges (gains)
Cash receipts (payments)		(11,159)
Non-cash activity
Restructuring charges, end of period		5,363		$ 16,522
Duarte Plant Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period		12,504
Charges (gains)	$ 17,013
Cash receipts (payments)		(7,908)
Non-cash activity
Restructuring charges, end of period		4,596		12,504
Industrial Turbomachinery Business Realignment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, beginning of period		4,018
Charges (gains)
Cash receipts (payments)		(3,251)		(491)
Non-cash activity
Restructuring charges, end of period		$ 767		$ 4,018