Supplemental Balance Sheet Information (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended
	Sep. 21, 2005	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Jul. 08, 2013	May 03, 2014	Jul. 31, 2014
Inventories [Abstract]
Raw material and component parts		$ 6,836,000		$ 6,836,000				$ 5,900,000
Work in progress		2,834,000		2,834,000				2,077,000
Finished goods		6,867,000		6,867,000				7,157,000
Inventory, net		16,537,000		16,537,000				15,134,000
Property, Plant and Equipment [Line Items]
Property and equipment, gross		21,341,000		21,341,000				19,105,000
Less accumulated depreciation		11,004,000		11,004,000				10,320,000
Property and equipment, net		10,337,000		10,337,000				8,785,000
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		27,633,000		27,633,000				19,500,000
Accumulated Amortization		6,644,000		6,644,000				6,117,000
Net		20,989,000		20,989,000				13,383,000
Goodwill acquired	10,660,000
Contingent payment obligation		561,000		561,000				0
Amortization included in general and administrative expense		295,000	186,000	543,000	366,000
Future amortization expense [Abstract]
2016		1,300,000		1,300,000
2017		1,300,000		1,300,000
2018		1,300,000		1,300,000
2019		1,300,000		1,300,000
2020		1,300,000		1,300,000
Deferred Revenue Arrangement [Line Items]
Less: Short-term portion		1,288,000		1,288,000				1,288,000
Long-term portion		12,598,000		12,598,000				13,242,000
Alcon, Inc. settlement [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue		13,886,000		13,886,000				14,530,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		9,500,000		9,500,000
Borrowings under credit facility		0		0
Equipment Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,000,000		1,000,000
Borrowings under credit facility		0		0
Description of variable rate basis				one-month LIBOR
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		13,000,000		13,000,000
Borrowings under credit facility		2,750,000		2,750,000
Amortization of advances under term loan				5 years
Restricted borrowing for earn-out payments		6,500,000		6,500,000
Description of variable rate basis				The one-, two- or three-month LIBOR plus
Basis spread on variable rate (in hundredths)				1.75%
Interest rate at period end (in hundredths)		1.90%		1.90%
Interest charge on unused portion of facility (in hundredths)				0.20%
Maturity date				Feb. 28, 2018
Number of financial covenants				2
Maximum leverage ratio				2.25
Minimum fixed charge coverage ratio				1.25
Debt to EBITDA ratio				0.33
Fixed charge coverage ratio				14.0
M.I.S.S. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired						1,459,000
Other intangible assets acquired						936,000
Ophthalmology Manufacturing Company [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired							439,000
Other intangible assets acquired							765,000
Sterimedix [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired		4,871,000
Other intangible assets acquired		8,180,000
Contingent payment obligation		2,561,000		2,561,000
Proprietary Know-How [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		4,208,000		4,208,000				4,208,000
Accumulated Amortization		2,381,000		2,381,000				2,208,000
Net		1,827,000		1,827,000				2,000,000
Other intangible assets acquired	3,707,000
Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		5,944,000		5,944,000				5,944,000
Accumulated Amortization		0		0				0
Net		5,944,000		5,944,000				5,944,000
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		2,960,000		2,960,000				447,000
Accumulated Amortization		60,000		60,000				44,000
Net		2,900,000		2,900,000				403,000
Licensing Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		5,694,000		5,694,000				5,694,000
Accumulated Amortization		3,030,000		3,030,000				2,895,000
Net		2,664,000		2,664,000				2,799,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		5,260,000		5,260,000				806,000
Accumulated Amortization		119,000		119,000				61,000
Net		5,141,000		5,141,000				745,000
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		1,123,000		1,123,000				26,000
Accumulated Amortization		25,000		25,000				6,000
Net		1,098,000		1,098,000				20,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		2,444,000		2,444,000				2,375,000
Accumulated Amortization		1,029,000		1,029,000				903,000
Net		1,415,000		1,415,000				1,472,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		1,688,000		1,688,000				984,000
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		6,667,000		6,667,000				6,650,000
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		10,375,000		10,375,000				9,023,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		1,401,000		1,401,000				1,182,000
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		1,116,000		1,116,000				1,113,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 94,000		$ 94,000				$ 153,000