Accounts Receivable - Revenue Reserve additional information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
ASU 2014-09
Accounts receivable
Net adjustment to opening retained earnings and accounts receivable	$ 3.2
Failure-to-supply reserves offset	3.5
Timing of recognition of contract manufacturing arrangements	$ 0.3
Chargebacks
Accounts receivable
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		53.00%	44.40%	53.50%	47.30%
Rebates
Accounts receivable
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		12.50%	15.70%	12.50%	15.60%
Returns
Accounts receivable
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		1.80%	0.80%	1.60%	1.40%
Other
Accounts receivable
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		3.30%	3.30%	3.00%	2.90%