Restructuring, Acquisition and Other Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Summary of restructuring, acquisition and other charges
Restructuring	$ 3,132
Acquisition and Other Charges:
Acquisitions and costs related to issuance of debt	17	38
Sponsor and administration fees paid to Silver Lake	198	281
Severance, facility and other charges not part of restructuring and not part of ongoing operations	261	73
Total	$ 3,608	$ 392