Accounting Policies (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Interest Paid (in Dollars)	$ 1,152,000	$ 658,000	$ 2,735,000	$ 1,353,000
Derivative Settlement On Interest Rate Swap (in Dollars)			929,000	1,297,000
Income Taxes Paid (in Dollars)			51,000
Proceeds from Income Tax Refunds (in Dollars)				7,247,000
Unrecognized Tax Benefits Excluding Income Tax Penalties and Interest (in Dollars)	2,157,000		2,157,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued (in Dollars)	358,000		358,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate (in Dollars)	82,000		82,000
Inventory Write-down (in Dollars)			122,000		153,000
Property, Plant and Equipment, Depreciation Methods			Depreciation is computed using the straight-line method.
Impairment of Real Estate (in Dollars)			$ 100,000	$ 1,200,000
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Estimated Useful Lives			15
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Estimated Useful Lives			40
Fixtures And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Estimated Useful Lives			3
Fixtures And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Estimated Useful Lives			20