Condensed Consolidated Statements of Income (Unaudited) (Percentage Change)	3 Months Ended
	Oct. 31, 2011
Net sales (%)	6.00%
Cost of products sold (%)	10.10%
Gross margin (%)	2.00%
Operating expenses:
Research and development (%)	(1.40%)
Selling, general and administrative (%)	(0.40%)
Restructuring charges (%)	(100.00%)
Total operating expenses (%)	(3.40%)
Operating income (%)	18.00%
Other income and (expense):
Investment and other income (expense) (%)	(169.70%)
Interest expense (%)	(11.30%)
Income before income taxes (%)	21.10%
Income taxes (%)	11.90%
Net income (%)	24.50%
Class A Nonvoting Common Stock
Net income per common share:
Basic net income (%)	24.00%
Diluted net income (%)	24.00%
Dividends (%)	2.80%
Class B Common Stock
Net income per common share:
Basic net income (%)	25.00%
Diluted net income (%)	25.00%
Dividends (%)	3.10%