Quarterly Information (unaudited) (Tables)

12 Months Ended

May 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information

Quarterly results of operations during the fiscal years ended May 31, 2017 and 2016 are as follows:

	2017
	First quarter		Second quarter		Third quarter		Fourth quarter
(in thousands, except per share data)
Net sales	$	88,098	$	89,029	$	85,602	$	86,914
Gross profit	45,032		45,010		43,792		42,335
Net income (loss) (1)	1,300		13,734		2,887		(12,913		)
Earnings (loss) per common share
Basic	0.04		0.37		0.08		(0.35		)
Diluted	0.04		0.37		0.08		(0.35		)

(1) Included within net income (loss) during the fourth quarter of fiscal 2017 is the $12.5 million charge for a litigation reserve (Note 15) and $4.5 million impact relating to the Acculis recall (Note 10).

	2016
	First quarter			Second quarter			Third quarter		Fourth quarter
(in thousands, except per share data)
Net sales	$	83,753		$	89,284		$	87,434	$	93,419
Gross profit	43,371			45,884			43,534		41,527
Net income (loss) (1)	(775		)	(334		)	594		(43,075		)
Earnings (loss) per common share
Basic	(0.02		)	(0.01		)	0.02		(1.19		)
Diluted	(0.02		)	(0.01		)	0.02		(1.19		)