Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2014	Jan. 31, 2014
Allowance for doubtful accounts receivable, current	$ 3,484	$ 5,469
Property, plant, and equipment, accumulated depreciation	328,933	320,827
Intangible assets, accumulated amortization	$ 198,986	$ 195,752
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	300,000	300,000
Common stock, shares issued	113,869	115,722
Common stock, shares outstanding	113,869	115,722