Restructuring, Acquisition and Other Charges (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013
Summary of nature of restructuring charges and amounts
Accrued	$ 3,132
Paid/Written-off	(2,356)
Balances as of April 30, 2013	776
Severance, payroll taxes employee benefits and other miscellaneous [Member]
Summary of nature of restructuring charges and amounts
Accrued	3,038
Paid/Written-off	(2,267)
Balances as of April 30, 2013	771
Facilities closures [Member]
Summary of nature of restructuring charges and amounts
Accrued	94
Paid/Written-off	(89)
Balances as of April 30, 2013	$ 5