Segment Information (Schedule of Net Sales and Gross Profit by Source Country) (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items]
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
Geographic region | United States
Segment Reporting Information [Line Items]
Net Sales															483,678	400,883	407,101
Gross Profit															116,792	117,180	111,734
Geographic region | Germany
Segment Reporting Information [Line Items]
Net Sales															79,105	76,666	69,889
Gross Profit															13,609	15,154	14,660
Geographic region | Netherlands
Segment Reporting Information [Line Items]
Net Sales															9,949	16,217	14,656
Gross Profit															1,231	1,598	1,325
Geographic region | France
Segment Reporting Information [Line Items]
Net Sales															35,796	30,177	27,976
Gross Profit															4,651	4,043	3,634
Geographic region | Asia-Pacific
Segment Reporting Information [Line Items]
Net Sales															29,790	34,581	27,329
Gross Profit															$ 4,509	$ 4,810	$ 4,081

[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.