Consolidated Condensed Statements of Shareholders' Equity Statement - 6 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock At Cost	Stock Employee Compensation Trust (SECT)	Supplemental Retirement Plan (SERP) Trust	Accumulated Other Comprehensive Loss	Class A Common Stock	Class A Common Stock Treasury Stock At Cost	Class A Common Stock Stock Employee Compensation Trust (SECT)	Class B Common Stock	Class B Common Stock Treasury Stock At Cost	Class B Common Stock Stock Employee Compensation Trust (SECT)	Class B Common Stock Supplemental Retirement Plan (SERP) Trust
Beginning of period, Amount at Sep. 30, 2017	$ 1,214,304	$ 51,280	$ 492,246	$ 1,847,819	$ (739,157)	$ (89,919)	$ (12,474)	$ (335,491)
Increase (Decrease) in Stockholders' Equity
Issuance of shares			(2,733)		5,184
Equity-based compensation expense			3,500
Adjustment to market - SECT, SERP and other			(2,958)
Net earnings attributable to Moog	15,264			15,264
Dividends				(8,978)
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	(47,077)			47,077				(47,077)
Class A and B shares purchased					(5,118)
Issuance of shares - SECT						1,941
Purchase of shares - SECT	(7,914)					(7,914)
Adjustment to market						2,562	396
Other comprehensive income (loss)	40,254							40,254
End of period, Amount at Mar. 31, 2018	$ 1,255,704	$ 51,280	$ 490,055	$ 1,901,182	$ (739,091)	$ (93,330)	$ (12,078)	$ (342,314)
Beginning of period - Common Stock at Sep. 30, 2017									43,704,286			7,575,427
Increase (Decrease) in Stockholders' Equity
Conversion of Class B to Class A									31,272			(31,272)
End of period - Common Stock at Mar. 31, 2018									43,735,558			7,544,155
Beginning of period, Shares at Sep. 30, 2017										(10,933,003)	(425,148)		(3,333,927)	(654,753)	(150,000)
Increase (Decrease) in Stockholders' Equity
Class A and B shares issued related to equity compensation, shares										79,679			28,239
Class A and B shares purchased, shares										(37,784)			(22,165)
Issuance of shares - SECT											0			21,871
Purchase of shares - SECT											0			(91,081)
End of period, Shares at Mar. 31, 2018										(10,891,108)	(425,148)		(3,327,853)	(723,963)	(150,000)
Increase (Decrease) in Stockholders' Equity
Common stock outstanding, shares									32,419,302			3,342,339