CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Net sales	$ 324,182	$ 320,584	$ 661,828	$ 670,092
Cost of products sold	174,130	167,279	347,156	348,956
Gross margin	150,052	153,305	314,672	321,136
Operating expenses:
Research and development	8,551	9,972	17,036	19,781
Selling, general and administrative	112,020	104,843	223,719	213,775
Restructuring charges	4,031	0	4,031	0
Impairment charge	0	115,688	0	115,688
Total operating expenses	124,602	230,503	244,786	349,244
Operating income (loss)	25,450	(77,198)	69,886	(28,108)
Other income and (expense):
Investment and other income	897	812	1,294	610
Interest expense	(4,406)	(4,933)	(8,569)	(9,980)
Income (loss) before income taxes	21,941	(81,319)	62,611	(37,478)
Income taxes	30,625	8,635	44,107	19,744
Net (loss) income	$ (8,684)	$ (89,954)	$ 18,504	$ (57,222)
Weighted average common shares outstanding (in thousands):
Basic	51,177	52,447	51,108	52,552
Diluted	51,177	52,447	51,507	52,552
Class A nonvoting common stock [Member]
Other income and (expense):
Basic net (loss) income (USD per share)	$ (0.17)	$ (1.72)	$ 0.36	$ (1.09)
Diluted net (loss) income (USD per share)	$ (0.17)	$ (1.72)	$ 0.36	$ (1.09)
Dividends (USD per share)	$ 0.19	$ 0.185	$ 0.38	$ 0.37
Class B voting common stock [Member]
Other income and (expense):
Basic net (loss) income (USD per share)	$ (0.17)	$ (1.72)	$ 0.34	$ (1.11)
Diluted net (loss) income (USD per share)	$ (0.17)	$ (1.72)	$ 0.34	$ (1.11)
Dividends (USD per share)	$ 0.19	$ 0.185	$ 0.36	$ 0.35