Inventories Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Inventory [Abstract]
Inventory write-down	$ 19,271	$ 0	$ 19,271	$ 0

Inventory Write-down Reserve for non-cash impairment impacts associated with COVID-19 pandemic

No definition available.

Name:	mog_InventoryWritedownReserve
Namespace Prefix:	mog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration