Unaudited Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended														12 Months Ended
	Jun. 30, 2017	[1],[2]	Mar. 31, 2017	[2],[3]	Dec. 31, 2016	[2]	Sep. 30, 2016	[4]	Jun. 30, 2016	[5]	Mar. 31, 2016	[6]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 194,620		$ 190,128		$ 125,552		$ 128,018		$ 135,424		$ 157,926		$ 131,674	$ 133,500	$ 638,318	$ 558,524	$ 546,951
Gross profit	36,829		42,319		30,805		30,839		34,047		38,289		35,868	34,581	140,792	142,785	135,434
Net income (loss)	$ 1,967		$ 5,588		$ (564)		$ 4,385		$ 6,774		$ 10,424		$ 8,270	$ 9,298	$ 11,376	$ 34,766	$ 33,483
Net income (loss) per diluted share (in dollars per share)	$ 0.06		$ 0.16		$ (0.02)		$ 0.15		$ 0.23		$ 0.35		$ 0.28	$ 0.32	$ 0.35	$ 1.18	$ 1.14

[1] Includes pretax item of $3,139 representing immaterial correction of an error associated with certain accrued expenses.

[2] Results for the last nine days of the quarter ended December 31, 2016 and for the subsequent two quarters reflect the acquisition of certain generic products and related assets from Citron and Lucid on December 21, 2016.

[3] Includes pretax item of $733 environmental remediation charge in connection with Arsynco.

[4] Includes pretax item of $170 environmental remediation charge in connection with Arsynco.

[5] Includes pretax item of $1,313 environmental remediation charge in connection with Arsynco.

[6] Includes pretax items consisting of $833 reversal of contingent consideration related to the PACK acquisition and $241 reversal of contingent consideration related to the acquisition of a company in France.