Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2011	Apr. 30, 2010
Condensed Consolidated Statements of Operations
Net sales	$ 131,081,000	$ 216,303,000	$ 472,052,000	$ 521,251,000
Cost of sales	74,110,000	141,512,000	289,937,000	333,185,000
Gross profit	56,971,000	74,791,000	182,115,000	188,066,000
Expenses:
Selling, general and administrative	22,552,000	25,628,000	69,742,000	70,256,000
Research and development	10,328,000	11,383,000	31,546,000	34,138,000
Amortization of intangibles	2,173,000	1,754,000	6,064,000	5,283,000
Merger termination fee, net	0	0	(12,500,000)	0
Total operating expenses	35,053,000	38,765,000	94,852,000	109,677,000
Operating income	21,918,000	36,026,000	87,263,000	78,389,000
Other expenses (income):
Interest expense	2,135,000	1,980,000	6,288,000	5,913,000
Interest income and other	(557,000)	(315,000)	(1,877,000)	(728,000)
Income before provision for income taxes	20,340,000	34,361,000	82,852,000	73,204,000
Provision for income taxes	6,085,000	12,565,000	26,845,000	26,043,000
Net income	$ 14,255,000	$ 21,796,000	$ 56,007,000	$ 47,161,000
Net income per share:
Basic	$ 0.54	$ 0.77	$ 2.05	$ 1.67
Diluted	$ 0.47	$ 0.67	$ 1.79	$ 1.48
Weighted average number of common shares outstanding - basic	26,577,000	28,291,000	27,310,000	28,254,000
Weighted average number of common and common equivalent shares outstanding - diluted	32,378,000	34,086,000	33,069,000	34,074,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date	$ 0.25	$ 0	$ 0.75	$ 0