Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2012	Jan. 31, 2012
Consolidated Balance Sheets [Abstract]
Accumulated depreciation of rental assets	$ 18,589	$ 20,978
Accumulated depreciation of property, equipment and improvements	$ 223,782	$ 215,525
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	11,944,544	8,145,863
Common stock, shares outstanding	11,944,544	8,292,147
Treasury stock, shares	3,798,681	3,652,397