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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 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]        
Net Sales $ 263,400us-gaap_SalesRevenueGoodsNet $ 241,849us-gaap_SalesRevenueGoodsNet $ 826,798us-gaap_SalesRevenueGoodsNet $ 782,267us-gaap_SalesRevenueGoodsNet
Operating Income 31,208us-gaap_OperatingIncomeLoss 28,835us-gaap_OperatingIncomeLoss 116,028us-gaap_OperatingIncomeLoss 121,451us-gaap_OperatingIncomeLoss
Specialty Foods [Member]        
Segment Reporting Information [Line Items]        
Net Sales 263,400us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
241,849us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
826,798us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
782,267us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
Operating Income 34,170us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
31,408us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
124,909us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
130,364us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lanc_SpecialtyFoodsMember
Corporate [Member]        
Segment Reporting Information [Line Items]        
Operating Income $ (2,962)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (2,573)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (8,881)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ (8,913)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember