Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Jul. 31, 2016		Apr. 30, 2016		Jan. 31, 2016		Oct. 31, 2015		Jul. 31, 2015		Apr. 30, 2015		Jan. 31, 2015		Oct. 31, 2014		Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Net sales	$ 282,106		$ 286,816		$ 268,630		$ 283,073		$ 288,636		$ 290,227		$ 282,628		$ 310,240		$ 1,120,625	$ 1,171,731	$ 1,225,034
Gross margin	141,089		145,443		132,892		139,349		129,069		140,999		138,203		150,161		558,773	558,432	609,564
Operating income	33,403	[1]	30,784	[1]	23,589	[1]	30,102	[1]	(32,763)	[1]	24,285	[1]	16,811	[1]	26,973	[1]	117,878	35,306	(41,211)
Earnings from continuing operations	$ 25,136		$ 20,981		$ 15,290		$ 18,703		(39,394)		17,213		11,584		15,499		80,110	4,902	(48,146)
(Loss) earnings from discontinued operations, net of income taxes									$ 0	[2]	$ 0		$ 0		$ (1,915)		0	(1,915)	2,178
Class A Nonvoting Common Stock [Member]
Earnings from continuing operations																	$ 80,110	$ 4,902	$ (48,238)
Net earnings (loss) from continuing operations per Class A Common Share:
Earnings (loss) from continuing operations, per basic share	$ 0.50	[3]	$ 0.42	[3]	$ 0.30	[3]	$ 0.37	[3]	$ (0.77)	[3]	$ 0.34	[3]	$ 0.23	[3]	$ 0.30	[3]	$ 1.59	$ 0.10	$ (0.93)
Diluted (loss) earnings from continuing operations per Class A Common Share, as reported	$ 0.49	[3]	$ 0.42	[3]	$ 0.30	[3]	$ 0.37	[3]	(0.77)	[3]	0.33	[3]	0.23	[3]	0.30	[3]	1.58	0.10	(0.93)
Earnings (loss) from discontinued operations per Class A Common Share:
Basic (in dollars per share)									0.00	[3]	0.00	[3]	0.00	[3]	(0.03)	[3]	0.00	(0.04)	0.04
Diluted (in dollars per share)									$ 0.00	[3]	$ 0.00	[3]	$ 0.00	[3]	$ (0.04)	[3]	$ 0.00	$ (0.04)	$ 0.04

[1] * In fiscal 2015, the Company recorded before tax impairment charges of $46,867 in the fourth quarter ended July 31, 2015 and before tax restructuring charges of $4,278, $4,879, $4,834 and $2,830 in the first, second, third, and fourth quarters of fiscal 2015, respectively, for a total of $16,821.

[2] ** In fiscal 2015, the loss from discontinued operations included a net loss on operations of $1,489 primarily related to professional fees associated with the divestiture and a $426 net loss on the sale of Die-Cut, recorded in the first quarter ended October 31, 2014.

[3] *** The sum of the quarters does not equal the year-to-date total for fiscal 2015 due to the quarterly changes inweighted-average shares outstanding.