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Business Segment Information (Summary Of Financial Information Attributable To Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]        
Net Sales $ 303,411us-gaap_SalesRevenueGoodsNet $ 292,281us-gaap_SalesRevenueGoodsNet $ 563,398us-gaap_SalesRevenueGoodsNet $ 540,418us-gaap_SalesRevenueGoodsNet
Operating Income 50,216us-gaap_OperatingIncomeLoss 56,185us-gaap_OperatingIncomeLoss 84,820us-gaap_OperatingIncomeLoss 92,616us-gaap_OperatingIncomeLoss
Specialty Foods [Member]        
Segment Reporting Information [Line Items]        
Net Sales 303,411us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
292,281us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
563,398us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
540,418us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
Operating Income 53,240us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
59,413us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
90,739us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
98,956us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
Corporate [Member]        
Segment Reporting Information [Line Items]        
Operating Income $ (3,024)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (3,228)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (5,919)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (6,340)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember