DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Outstanding Commodity Contracts (Details)	3 Months Ended		12 Months Ended
	Dec. 28, 2019 lb T gal	Dec. 29, 2018 lb T gal	Sep. 30, 2019 lb T gal
Urea (in tons)
Derivative [Line Items]
Outstanding commodity contracts, mass | T	45,500	52,000	78,500
Resin (in pounds)
Derivative [Line Items]
Outstanding commodity contracts, mass | lb	11,000,000	12,600,000	14,900,000
Diesel (in gallons)
Derivative [Line Items]
Outstanding commodity contracts, volume	4,368,000	4,410,000	4,956,000
Heating Oil (in gallons)
Derivative [Line Items]
Outstanding commodity contracts, volume	1,344,000	1,218,000	1,344,000