Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Allowance for doubtful accounts receivable, current	$ 3,611	$ 4,217
Property, plant, and equipment, accumulated depreciation	338,587	334,619
Intangible assets, accumulated amortization	$ 217,811	$ 209,931
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	300,000	300,000
Common stock, shares issued	117,190	115,790
Common stock, shares outstanding	117,190	115,790