Financial Instruments and Fair Value Measurements (Schedules of Concentration of Risk) (Details)	3 Months Ended		12 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Dec. 29, 2017
Distributor Concentration Risk | Net Sales Attributable to Distributors | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	47.00%	55.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	31.00%		34.00%
Product Concentration Risk | Net Sales Attributable to Products | Acthar
Concentration Risk
Concentration Risk, Percentage	43.00%	49.00%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk
Concentration Risk, Percentage	24.00%	23.00%
Product Concentration Risk | Net Sales Attributable to Products | Ofirmev
Concentration Risk
Concentration Risk, Percentage	14.00%	13.00%
Product Concentration Risk | Net Sales Attributable to Products | Therakos [Member]
Concentration Risk
Concentration Risk, Percentage	10.00%