Supplemental Balance Sheet Information (Details) (USD $)	0 Months Ended	3 Months Ended				3 Months Ended		0 Months Ended
	Sep. 21, 2013	Oct. 31, 2013	Jul. 31, 2013	Oct. 31, 2013 Alcon settlement [Member]	Jul. 31, 2013 Alcon settlement [Member]	Oct. 31, 2013 Revolving Credit Facility [Member] Covenant	Oct. 31, 2013 Equipment Line of Credit [Member]	Jul. 08, 2013 M.I.S.S. [Member]	Oct. 31, 2013 Proprietary Know-How [Member]	Jul. 31, 2013 Proprietary Know-How [Member]	Oct. 31, 2013 Trademark [Member]	Jul. 31, 2013 Trademark [Member]	Oct. 31, 2013 Licensing Agreements [Member]	Jul. 31, 2013 Licensing Agreements [Member]	Oct. 31, 2013 Customer Relationships [Member]	Jul. 31, 2013 Customer Relationships [Member]	Oct. 31, 2013 Other Intangibles [Member]	Jul. 31, 2013 Other Intangibles [Member]	Oct. 31, 2013 Patents [Member]	Jul. 31, 2013 Patents [Member]	Oct. 31, 2013 Land [Member]	Jul. 31, 2013 Land [Member]	Oct. 31, 2013 Building and improvements [Member]	Jul. 31, 2013 Building and improvements [Member]	Oct. 31, 2013 Machinery and equipment [Member]	Jul. 31, 2013 Machinery and equipment [Member]	Oct. 31, 2013 Furniture and fixtures [Member]	Jul. 31, 2013 Furniture and fixtures [Member]	Oct. 31, 2013 Software [Member]	Jul. 31, 2013 Software [Member]	Oct. 31, 2013 Construction in progress [Member]	Jul. 31, 2013 Construction in progress [Member]
Inventories [Abstract]
Raw material and component parts		$ 6,786,000	$ 7,418,000
Work in progress		1,829,000	1,133,000
Finished goods		7,414,000	6,274,000
Inventory, net		16,029,000	14,825,000
Property, Plant and Equipment [Line Items]
Property and equipment, gross		18,467,000	18,102,000																		730,000	730,000	6,515,000	6,365,000	8,799,000	8,665,000	1,040,000	1,058,000	1,108,000	1,107,000	275,000	177,000
Less accumulated depreciation		9,469,000	9,140,000
Property and equipment, net		8,998,000	8,962,000
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		19,165,000	19,037,000						4,057,000	4,057,000	5,940,000	5,938,000	5,834,000	5,834,000	557,000	531,000	427,000	407,000	2,350,000	2,270,000
Accumulated Amortization		6,122,000	5,911,000						2,348,000	2,286,000	0	0	2,834,000	2,766,000	17,000	0	13,000	0	910,000	859,000
Net		13,043,000	13,126,000						1,709,000	1,771,000	5,940,000	5,938,000	3,000,000	3,068,000	540,000	531,000	414,000	407,000	1,440,000	1,411,000
Goodwill acquired	10,660,000							1,568,000
Other intangible assets acquired								984,000
Amortization included in general and administrative expense		180,000
Future amortization expense [Abstract]
2014		800,000
2015		800,000
2016		800,000
2017		800,000
2018		800,000
Line of Credit Facility [Line Items]
Maximum borrowing capacity						9,500,000	1,000,000
Current borrowing capacity						8,900,000
Description of variable rate basis						The one-, two- or three-month LIBOR plus	one-month LIBOR
Basis spread on variable rate (in hundredths)						2.00%	3.00%
Interest rate at period end (in hundredths)						2.24%
Interest charge on unused portion of facility (in hundredths)						0.20%
Borrowings under credit facility						0	0
Maturity date						Sep. 30, 2016	Sep. 30, 2016
Number of financial covenants						2
Maximum leverage ratio						3.75
Minimum fixed charge coverage ratio						1.1
Leverage ratio						0.61
Fixed charge coverage ratio						553.1
Minimum interest rate (in hundredths)							3.50%
Deferred Revenue Arrangement [Line Items]
Deferred revenue				15,496,000	15,818,000
Less: Short-term portion		1,288,000	1,288,000
Long-term portion		$ 14,208,000	$ 14,530,000