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Pension and Postretirement Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2017
Jan. 01, 2017
Pension Benefits        
COMPONENTS OF NET PERIODIC BENEFIT COST:        
Service cost $ 16 $ 13 $ 33 $ 27
Interest cost 964 981 1,928 1,962
Expected return on plan assets (1,527) (1,463) (3,055) (2,927)
Amortization of prior service cost (credit) 3 3 6 6
Amortization of unrecognized net loss 508 807 1,017 1,614
Net periodic benefit (credit) cost (36) 341 (71) 682
Postretirement Benefits        
COMPONENTS OF NET PERIODIC BENEFIT COST:        
Service cost 4 4 7 7
Interest cost 11 13 22 27
Amortization of prior service cost (credit) (191) (191) (382) (382)
Amortization of unrecognized net loss 120 134 240 269
Net periodic benefit (credit) cost $ (56) $ (40) $ (113) $ (79)