Other Long-Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012		Jan. 31, 2011
Other Long-term Debt [Abstract]
Liability for severance pay	$ 51,197		$ 61,910
Tax contingencies	125,687		151,937
Contingent consideration	28,494		1,491
Other long-term liabilities	8,813		13,991
Other Liabilities	214,191		229,329
Severance pay fund	$ 35,510	[1]	$ 44,674	[1]

[1] Represents deposits into insurance policies to fund severance liability (see Note 16, Other Long-Term Liabilities).