Financial Instruments and Fair Value Measurements (Schedules of Concentration of Risk) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 25, 2021	Jun. 26, 2020	Jun. 25, 2021	Jun. 26, 2020	Dec. 25, 2020
Distributor Concentration Risk | Revenue from Contract with Customer Benchmark [Member] | CuraScript, Inc
Concentration Risk
Concentration Risk, Percentage	23.70%	30.20%	24.40%	27.50%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation [Member]
Concentration Risk
Concentration Risk, Percentage			34.80%		33.60%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation [Member]
Concentration Risk
Concentration Risk, Percentage			17.70%		18.20%
Product Concentration Risk | Net Sales Attributable to Products | Acthar
Concentration Risk
Concentration Risk, Percentage	27.70%	30.50%	25.40%	27.90%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk
Concentration Risk, Percentage	19.40%	22.10%	21.70%	21.70%
Product Concentration Risk | Net Sales Attributable to Products | Therakos [Member]
Concentration Risk
Concentration Risk, Percentage	12.50%		12.30%