Financial Instruments and Fair Value Measurements (Schedules of Concentration of Risk) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019	Dec. 27, 2019
Distributor Concentration Risk | Revenue from Contract with Customer Benchmark [Member] | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	30.20%	31.90%	27.50%	29.80%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation [Member]
Concentration Risk
Concentration Risk, Percentage			27.10%		31.30%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation [Member]
Concentration Risk
Concentration Risk, Percentage			17.10%		15.30%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage			11.50%		12.10%
Product Concentration Risk | Net Sales Attributable to Products | Acthar
Concentration Risk
Concentration Risk, Percentage	30.50%	32.40%	27.90%	30.40%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk
Concentration Risk, Percentage	22.10%	17.00%	21.70%	18.00%
Product Concentration Risk | Net Sales Attributable to Products | Ofirmev
Concentration Risk
Concentration Risk, Percentage		11.00%		11.50%