Summary of Significant Accounting Policies (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 1,258	$ 1,307	$ 1,501
Credits issued during the year	(14)	(46)	(270)
Balance at end of year	78,403	1,258	1,307
Chargebacks
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	59,919	22,715	32,167
Acquisitions		23,526
Current year provision	594,258	431,606	247,186
Credits issued during the year	(587,490)	(417,928)	(256,638)
Balance at end of year	66,687	59,919	22,715
Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	32,359	22,828	30,692
Acquisitions		1,496
Current year provision	26,228	19,666	7,618
Credits issued during the year	(17,076)	(11,631)	(15,482)
Balance at end of year	41,511	32,359	22,828
Government Reimbursed Rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	8,864	1,312	938
Acquisitions		4,500
Current year provision	21,258	7,694	5,124
Credits issued during the year	(20,464)	(4,642)	(4,750)
Balance at end of year	9,658	8,864	1,312
Non-Governmental Rebates & Other
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	55,933	7,202	4,335
Acquisitions		28,944
Current year provision	229,453	178,623	90,915
Credits issued during the year	(199,127)	(158,836)	(88,048)
Balance at end of year	86,259	55,933	7,202
Sales Discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	6,037	2,423	2,682
Acquisitions		2,360
Current year provision	21,573	20,129	10,267
Credits issued during the year	(21,202)	(18,875)	(10,526)
Balance at end of year	$ 6,408	$ 6,037	$ 2,423