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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

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- Definition Inventory [Abstract] + References No definition available. + Details
Name: | mog_InventoryAbstract
Namespace Prefix: | mog_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Inventory Write-down Reserve for non-cash impairment impacts associated with COVID-19 pandemic + References No definition available. + Details
Name: | mog_InventoryWritedownReserve
Namespace Prefix: | mog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration