Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income	Comprehensive Income (Loss)	Noncontrolling Interest with Redemption Feature
Beginning Balance at Jan. 31, 2009	$ 586,445	$ 602,064	$ (26,853)	$ 11,234
Beginning Balance (in shares) at Jan. 31, 2009		94,126
Net income (loss)	(21,889)		(21,889)		(21,889)
Foreign currency translation adjustment	10,689			10,689	10,689
Change in pension liability, after tax (expense) benefit of $110 in 2012, $1,667 in 2011 and $457 in 2010	(682)			(682)	(682)
Unrealized gain (loss)on derivatives, after tax (expense) benefit of $73 in 2012, $279 in 2011 and $108 in 2010	4,923			4,923	4,923
Comprehensive income (loss)					(6,959)
Stock issued under stock option and stock purchase plans (in shares)		4,449
Stock issued under stock option and stock purchase plans	20,059	20,059
Stock issued for acquisition (in shares)		1,903
Stock issued for acquisition	14,911	14,911
Stock compensation expense	25,657	25,657
Reduction of tax benefit from share options exercised	(96)	(96)
Ending Balance at Jan. 31, 2010	640,017	662,595	(48,742)	26,164
Ending Balance (in shares) at Jan. 31, 2010		100,478
Net income (loss)	28,584		28,584		28,584
Foreign currency translation adjustment	1,595			1,595	1,595
Change in pension liability, after tax (expense) benefit of $110 in 2012, $1,667 in 2011 and $457 in 2010	2,349			2,349	2,349
Unrealized gain (loss)on derivatives, after tax (expense) benefit of $73 in 2012, $279 in 2011 and $108 in 2010	1,585			1,585	1,585
Comprehensive income (loss)					34,113
Stock issued under stock option and stock purchase plans (in shares)		5,150
Stock issued under stock option and stock purchase plans	27,530	27,530
Stock issued for acquisition (in shares)		5,621
Stock issued for acquisition	54,028	54,028
Stock compensation expense	21,026	21,026
Ending Balance at Jan. 31, 2011	776,714	765,179	(20,158)	31,693
Ending Balance (in shares) at Jan. 31, 2011	111,249	111,249
Net income (loss)	83,872		83,872		83,872	(485)
Foreign currency translation adjustment	(3,022)			(3,022)	(3,022)	(127)
Change in pension liability, after tax (expense) benefit of $110 in 2012, $1,667 in 2011 and $457 in 2010	212			212	212
Unrealized gain (loss)on derivatives, after tax (expense) benefit of $73 in 2012, $279 in 2011 and $108 in 2010	(203)			(203)	(203)
Comprehensive income (loss)					80,859
Convertible debt feature	42,531	42,531
Acquisition of controlling interest	(815)	(815)				8,196
Adjustment of noncontrolling interest to redemption value	(1,682)		(1,682)			1,682
Stock issued under stock option and stock purchase plans (in shares)		4,902
Stock issued under stock option and stock purchase plans	37,459	37,459
Stock repurchased (in shares)		(6,805)
Stock repurchased	(89,995)	(89,995)
Stock compensation expense	21,003	21,003
Ending Balance at Jan. 31, 2012	$ 866,074	$ 775,362	$ 62,032	$ 28,680		$ 9,266
Ending Balance (in shares) at Jan. 31, 2012	109,346	109,346