Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011
Current assets:
Accumulated depreciation of rental assets	$ 20,813	$ 20,312
Accumulated depreciation of property, equipment and improvements	$ 214,024	$ 204,225
Shareholders' equity:
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	11,944,544
Common stock, shares outstanding	8,381,747	8,743,550
Treasury stock, shares	3,562,797	3,200,994