Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Other intangible assets
Gross	$ 484,124	$ 478,548
Accumulated Amortization	(438,463)	(401,284)
Net	45,661	77,264
Technology, licenses and patents [Member]
Other intangible assets
Gross	184,213	178,699
Accumulated Amortization	(179,159)	(178,699)
Net	5,054
Customer relationships [Member]
Other intangible assets
Gross	278,900	278,900
Accumulated Amortization	(240,663)	(206,030)
Net	38,237	72,870
Trademarks [Member]
Other intangible assets
Gross	14,300	14,300
Accumulated Amortization	(12,334)	(10,559)
Net	1,966	3,741
Internal-use software [Member]
Other intangible assets
Gross	6,711	6,649
Accumulated Amortization	(6,307)	(5,996)
Net	$ 404	$ 653