Significant Customers and Concentration of Credit Risk (Details)	12 Months Ended
Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Net sales [Member] \| Customer concentration risk [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	32.50%	32.60%	31.70%
Net sales [Member] \| Customer concentration risk [Member] \| Southern Glazer's Wine and Spirits [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	13.00%	14.10%	13.40%
Accounts receivable [Member] \| Credit concentration risk [Member] \| Southern Glazer's Wine and Spirits [Member]
Concentration Risk [Line Items]
Concentration risk, Percentage	28.10%	32.10%	32.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration