Assets Held for Sale - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 30, 2017 Facility
Long Lived Assets Held For Sale [Line Items]
Impairment of Long-Lived Assets Held-for-Sale | $	$ 5.3
Depots
Long Lived Assets Held For Sale [Line Items]
Number of Acquired Hostess Bread Assets unsold		1
Acquired Hostess Bread Assets Classified as Held for Sale
Long Lived Assets Held For Sale [Line Items]
Impairment of Long-Lived Assets Held-for-Sale | $	$ 4.6
Acquired Hostess Bread Assets Plants and Depots | Plants
Long Lived Assets Held For Sale [Line Items]
Number of Acquired Hostess Bread Assets to be sold		20
Acquired Hostess Bread Assets Plants and Depots | Depots
Long Lived Assets Held For Sale [Line Items]
Number of Acquired Hostess Bread Assets to be sold		36