Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jan. 31, 2017	Jan. 31, 2016
Consolidated Balance Sheets
Accounts receivable - trade, allowance for doubtful accounts	$ 13.5	$ 11.3
Property and equipment, accumulated depreciation	$ 149.4	$ 109.3
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	53,500,000	53,300,000
Treasury stock	1,500,000	400,000