(Schedules of Concentration of Risk) (Details)	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Distributor Concentration Risk | Revenue from Contract with Customer Benchmark [Member] | CuraScript, Inc [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	29.70%	35.20%	40.10%
Distributor Concentration Risk | Revenue from Contract with Customer Benchmark [Member] | Amerisource Bergen Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.20%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	12.10%	13.10%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	15.30%	21.90%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	31.30%	25.70%
Product Concentration Risk | Net Sales Attributable to Products | Acthar Gel
Concentration Risk [Line Items]
Concentration risk, percentage	30.10%	34.50%	37.10%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk [Line Items]
Concentration risk, percentage	18.10%	16.90%	15.70%
Product Concentration Risk | Net Sales Attributable to Products | Ofirmev [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	12.10%	10.60%