CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Jul. 31, 2011
Current assets:
Cash and cash equivalents	$ 189,545	$ 169,656
Accounts receivable, net of allowance for doubtful accounts of $693 and $599 as of April 30, 2012 and July 31, 2011, respectively	78,367	88,558
Inventories	113,618	105,483
Refundable and deferred income taxes	7,613	9,677
Other current assets	7,713	9,839
Total current assets	396,856	383,213
Property, plant, and equipment, net	93,661	83,157
Goodwill and intangible assets, net	36,954	39,252
Other assets	6,190	7,711
Deferred income tax assets	9,181	8,219
Total Assets	542,842	521,552
Current liabilities:
Accounts payable	42,523	37,478
Accrued liabilities	35,057	41,438
Advance payments and deferred revenue	12,945	9,249
Accrued income taxes	3,184	661
Total current liabilities	93,709	88,826
Long-term liabilities:
Accrued income taxes	4,551	5,322
Other long-term liabilities	2,675	3,932
Total long-term liabilities	7,226	9,254
Commitments and contingencies (Note 16)
Stockholders' equity:
Common stock, $0.05 par value	613	627
Capital in excess of par value	94,789	85,407
Retained earnings	339,242	325,941
Accumulated other comprehensive income	7,263	11,497
Total stockholders' equity	441,907	423,472
Total Liabilities and Stockholders' Equity	$ 542,842	$ 521,552