(Schedules of Concentration of Risk) (Details)	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
Distributor Concentration Risk | Net Sales Attributable to Distributors | CuraScript, Inc [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	43.00%	40.00%	38.00%	35.00%
Distributor Concentration Risk | Net Sales Attributable to Distributors | McKesson Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%		12.00%	20.00%
Distributor Concentration Risk | Net Sales Attributable to Distributors | Cardinal Health, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage				11.00%
Distributor Concentration Risk | Net Sales Attributable to Distributors | Amerisource Bergen Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage				10.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | CuraScript, Inc [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	14.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | McKesson Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	28.00%	26.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Cardinal Health, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	11.00%
Distributor Concentration Risk | Accounts Receivable Attributable to Distributors | Amerisource Bergen Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	15.00%
Product Concentration Risk | Net Sales Attributable to Products | H.P. Acthar Gel
Concentration Risk [Line Items]
Concentration risk, percentage	39.00%	37.00%	34.00%	35.00%
Product Concentration Risk | Net Sales Attributable to Products | Inomax
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	16.00%	14.00%	6.00%