Property and Equipment, Net (Details) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 305,187,000	$ 374,666,000
Less accumulated depreciation and amortization	(233,215,000)	(311,684,000)
Property, Plant and Equipment, Net (excluding Land)	71,972,000	62,982,000
Total	75,713,000	66,843,000
Property Plant and Equipment Income Statement Disclosures [Abstract]
Depreciation and amortization expense	28,500,000	32,500,000	42,300,000
Disposed of property and equipment	2,400,000	1,300,000	6,400,000
Sale of land in Ra'anana, Israel		28,500,000
Proceeds from Ra'anana land sale		27,100,000
Gain from Ra'anana land sale		2,400,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,741,000	3,861,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	229,832,000	297,840,000
Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	44,304,000	44,378,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,204,000	2,204,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 28,847,000	$ 30,244,000