Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Allowance for doubtful accounts receivable, current	$ 3,207	$ 3,826
Property, plant, and equipment, accumulated depreciation	365,398	348,597
Intangible assets, accumulated amortization	$ 232,518	$ 225,818
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	300,000	300,000
Common stock, shares issued	108,141	114,934
Common stock, shares outstanding	108,141	114,934