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Accounts Receivable, net - Revenue reserve information (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Accounts receivable, net
Settlement payment		$ 9.4
Reimbursement of overpayment		$ 8.1
ASU 2014-09
Accounts receivable, net
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, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		47.20%	51.40%	52.00%
Rebates
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		13.90%	12.30%	13.50%
Returns
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		1.00%	2.10%	1.10%
Other
Accounts receivable, net
Percentage of provision for rebates, chargebacks, returns and other adjustments on gross sales		5.50%	3.30%	3.20%