Acquisition - Additional Information (Detail) € in Millions, AUD in Millions, $ in Millions		3 Months Ended			9 Months Ended			12 Months Ended
	Aug. 17, 2017 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Aug. 31, 2017 EUR (€)	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Nov. 30, 2018 USD ($)	Aug. 17, 2017 USD ($)	Nov. 30, 2016 USD ($)	Feb. 28, 2015 AUD	May 31, 2017 USD ($)
Business Acquisition [Line Items]
Finite lived assets, useful life					12 years 8 months 12 days	12 years 8 months 12 days
Business acquisition valuation of assets allocated to goodwill			$ 4,503.3	$ 1,813.3		$ 4,503.3	$ 1,813.3			$ 1,771.4
Transaction costs recognized in selling, general and administrative expenses			0.7	4.9		2.8	12.5
Payments to Acquire Interest in Joint Venture						1.2	0.0
RB Foods
Business Acquisition [Line Items]
Net Assets acquired	$ 4,205.7								$ 4,205.7
Cash acquired	24.3								24.3
Working capital adjustment	11.2								11.2
Net sales						3,718.1	3,572.5		570.0
Indefinite lived intangibles acquired	2,475.0								2,475.0
Finite lived intangible assets acquired	$ 120.0								120.0
Finite lived assets, useful life	15 years
Business acquisition valuation of assets allocated to goodwill	$ 2,553.9								$ 2,553.9
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			22.5
Anticipated acquisition cost	100.0		45.8			45.8
Anticipated acquisition cost, current	$ 60.0
Amortization and depreciation							6.0
Adjustments to inventory							20.0
RB Foods | Forecasted
Business Acquisition [Line Items]
Anticipated acquisition cost		$ 31.4						$ 22.8
Kohinoor Specialty Foods [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired												15.00%
Business Combination, Consideration Transferred						113.0
Payments to Acquire Businesses, Net of Cash Acquired						1.6
Payments to Acquire Interest in Joint Venture						1.2
Cumulative Effect on Retained Earnings, before Tax						$ 0.6
Gourmet Garden [Member]
Business Acquisition [Line Items]
Net sales | AUD											AUD 70
Indefinite lived intangibles acquired												$ 27.6
Finite lived intangible assets acquired												18.9
Finite lived assets, useful life					14 years 2 months	14 years 2 months
Business acquisition valuation of assets allocated to goodwill												53.7
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						$ 32.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, definite lived intangible assets						4.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Total												16.0
business combinations, final goodwill adjustments												7.6
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, tangible assets						4.4
Cash Acquired from Acquisition							$ 3.3
Proceeds from Previous Acquisition				$ 1.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, indefinite lived intangible assets						$ 7.3
Payments to Acquire Businesses, Net of Cash Acquired										$ 116.2
Giotti
Business Acquisition [Line Items]
Net sales | €					€ 53
Indefinite lived intangibles acquired												9.8
Finite lived intangible assets acquired												38.0
Finite lived assets, useful life					11 years 11 months	11 years 11 months
Business acquisition valuation of assets allocated to goodwill												74.9
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			$ 20.5			$ 50.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Total												1.3
Business Acquisition, Transaction Costs												$ 2.5
Cash Acquired from Acquisition						1.2
Payments to Acquire Businesses, Net of Cash Acquired						$ 124.0