CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Net sales	$ 305,974	$ 270,866
Cost of products sold	149,029	121,342
Gross margin	156,945	149,524
Operating expenses:
Research and development	8,587	7,887
Selling, general and administrative	112,687	99,009
Restructuring charges	6,840	0
Total operating expenses	128,114	106,896
Operating income	28,831	42,628
Other income and (expense):
Investment and other income	762	397
Interest expense	(3,721)	(4,163)
Earnings from continuing operations before income taxes	25,872	38,862
Income tax expense	8,449	13,077
Earnings from continuing operations	17,423	25,785
Earnings from discontinued operations, net of income taxes	6,505	1,403
Net earnings	23,928	27,188
Weighted average common shares outstanding (in thousands):
Basic	52,071	51,039
Diluted	52,419	51,312
Class A nonvoting common stock [Member]
Other income and (expense):
Earnings from continuing operations	17,378	25,726
Earnings per share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.33	$ 0.50
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.33	$ 0.50
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 0.13	$ 0.03
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.13	$ 0.03
Earnings Per Share, Basic	$ 0.46	$ 0.53
Earnings Per Share, Diluted	$ 0.46	$ 0.53
Dividends	$ 0.195	$ 0.19
Class B voting common stock [Member]
Other income and (expense):
Earnings from continuing operations	$ 16,559	$ 24,925
Earnings per share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.32	$ 0.49
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.32	$ 0.49
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 0.12	$ 0.03
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.12	$ 0.02
Earnings Per Share, Basic	$ 0.44	$ 0.52
Earnings Per Share, Diluted	$ 0.44	$ 0.51
Dividends	$ 0.178	$ 0.173