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Stock Employee Compensation Trust and Supplemental Retirement Plan Trust	12 Months Ended
	Sep. 30, 2017
Share-based Compensation [Abstract]
Stock Employee Compensation Trust and Supplemental Retirement Plan Trust	Stock Employee Compensation Trust and Supplemental Retirement Plan Trust The Stock Employee Compensation Trust (SECT) assists in administering and provides funding for equity-based compensation plans and benefit programs, including the Moog Inc. Retirement Savings Plan (RSP). The Supplemental Retirement Plan (SERP) Trust provides funding for benefits under the Moog Inc. SERP. Both the SECT and the SERP Trusts hold shares as investments. The shares in the SECT and SERP Trusts are not considered outstanding for purposes of calculating earnings per share. However, in accordance with the trust agreements governing the SECT and SERP Trusts, the trustees vote all shares held by the SECT and SERP Trusts on all matters submitted to shareholders.