DISCONTINUED OPERATIONS - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal			$ 0.0	$ 0.0	$ 1.4
Deferred taxes expense (benefit)			83.6	1.3	12.1
Cash received from sale of business			0.0	0.0	7.2
Scotts LawnService
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal			131.2	0.0	0.0
Deferred taxes expense (benefit)			51.9
Cash provided by operating activities from discontinued operations			26.8	28.2	19.2
Cash used in investing activities from discontinued operations			(1.4)	(24.3)	(3.4)
Wild Bird Food
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received from sale of business		$ 4.1
Future earn-out payments		$ 1.0
Proceeds from sale of manufacturing facilities	$ 3.1
Gain on sale of assets	$ 1.2		$ 0.0	$ 0.0	$ 1.2