Segment Information (narrative) (detail)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Export [Member] \| Sales Revenue Net [Member]
Segment Reporting Information [Line Items]
Net Sales Percentage	7.70%	8.50%	9.00%
Green Giant Vegetables [Member] \| Sales Revenue Net [Member]
Segment Reporting Information [Line Items]
Net Sales Percentage	10.00%	11.00%	13.00%
Fruit And Vegetable Segment [Member]
Segment Reporting Information [Line Items]
Assets Percentage	99.00%	99.00%	99.00%
Income Loss Fom Continuing Operations Before Income Taxes Percentage	97.00%	100.00%	102.00%

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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611

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