Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Net income (loss)	$ 27,530	$ (2,353)
Other comprehensive income (loss), net of tax:
Change in unrealized gain on derivative instruments	453	457
Change in accumulated translation adjustment	(781)	9,084
Change in pension liability	(3)	0
Other comprehensive income	27,199	7,188
Less: comprehensive loss attributable to the noncontrolling interest	(673)	0
Comprehensive income attributable to Mentor	$ 27,872	$ 7,188