Condensed Consolidated Statements of Income (Unaudited) (Percentage Change)	3 Months Ended	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2012
Net sales (%)	(1.90%)	0.50%
Cost of products sold (%)	0.80%	3.00%
Gross margin (%)	(4.50%)	(2.00%)
Operating expenses:
Research and development (%)	(15.30%)	(10.90%)
Selling, general and administrative (%)	(7.20%)	(3.60%)
Restructuring charges (%)	184.10%	(50.80%)
Impairment charge (%)
Total operating expenses (%)	(6.10%)	26.00%
Operating income (%)	0.20%	(89.30%)
Other income and (expense):
Investment and other income (%)	(22.30%)	(40.50%)
Interest expense (%)	(7.20%)	(11.60%)
Income (loss) before income taxes (%)	0.40%	(100.10%)
Income taxes (%)	12.40%	10.00%
Net income (loss) (%)	(3.30%)	(137.40%)
Class A nonvoting common stock
Net income per common share:
Basic net income (loss) (%)	(1.90%)	(138.00%)
Diluted net income (loss) (%)	(3.70%)	(138.30%)
Dividends (%)	2.80%	2.80%
Class B common stock
Net income per common share:
Basic net income (loss) (%)	(1.90%)	(139.20%)
Diluted net income (loss) (%)	(3.70%)	(139.50%)
Dividends (%)	2.80%	2.90%