Condensed Consolidated Statements of Income (Unaudited) (Percentage Change)	3 Months Ended	6 Months Ended
	Jan. 31, 2012	Jan. 31, 2012
Net sales (%)	(2.60%)	1.70%
Cost of products sold (%)	(1.60%)	4.10%
Gross margin (%)	(3.60%)	(0.70%)
Operating expenses:
Research and development (%)	(15.00%)	(8.70%)
Selling, general and administrative (%)	(3.00%)	(1.70%)
Total operating expenses (%)	89.00%	42.60%
Operating (loss) income (%)	(308.20%)	(135.70%)
Other income and (expense):
Investment and other income (%)	(30.80%)	(58.30%)
Interest expense (%)	(15.70%)	(13.50%)
(Loss) Income before income taxes (%)	(351.00%)	(154.60%)
Income taxes (%)	5.20%	8.90%
Net (loss) income (%)	(471.70%)	(213.40%)
Class A Nonvoting Common Share
Net income per common share:
Basic net (loss) income (%)	(473.90%)	(213.50%)
Diluted net (loss) income (%)	(473.90%)	(214.70%)
Dividends (%)	2.80%	2.80%
Class B Common Share
Net income per common share:
Basic net (loss) income (%)	(473.90%)	(218.10%)
Diluted net (loss) income (%)	(473.90%)	(218.10%)
Dividends (%)	2.80%	2.90%