Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jul. 31, 2012	Jul. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 14,190	$ 23,641
Adjustments to reconcile net income to net cash provided by operating activities
Provison for deferred income taxes	3,593	2,213
Depreciation and amortization	8,043	9,205
Share-based compensation expense	5,954	5,401
Excess tax benefit from share-based compensation	(1,970)	(21)
Other	701	260
Gain on sale of other investments		(2,500)
Net changes in operating assets and liabilities:
Accounts receivable	10,168	9,343
Inventory	(16,377)	507
Refundable income taxes	(1,150)
Other current assets	(3,055)	1,378
Accounts payable	(795)	(5,008)
Accrued liabilities	(9,045)	(6,927)
Advance payments and deferred revenue	(469)	1,549
Accrued income taxes	(2,767)	(1,455)
Other liabilities	307	583
Total net changes in operating assets and liabilities:	(23,235)	(30)
NET CASH PROVIDED BY OPERATING ACTIVITIES	7,328	38,169
INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(12,914)	(17,250)
Proceeds from the sale of other investments		2,500
NET CASH USED FOR INVESTING ACTIVITIES	(12,914)	(14,750)
FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	4,035	480
Shares repurchased for taxes for vested employee restricted stock awards	(4,443)
Contingent consideration payment	(340)
Excess tax benefit from share-based compensation	1,970	21
Purchase of common stock	(6,024)	(15,612)
Dividends paid to shareholders	(2,664)	(2,609)
NET CASH USED FOR FINANCING ACTIVITIES	(7,466)	(17,720)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	1,166	(1,049)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(11,886)	4,650
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	187,011	169,656	169,656
CASH AND CASH EQUIVALENTS, END OF PERIOD	175,125	174,306	187,011	169,656
Supplemental disclosure of non-cash investing activities from continuing operations were as follows
Accounts payable payments towards the construction of a manufacturing facilities	1,307	1,015	1,755	1,785
Other property, plant, and equipment that was included in accounts payable	$ 614