Restructuring, Acquisition and Other Charges - Summary of Restructuring, Acquisition and Other Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Business Combinations [Abstract]
Restructuring	$ 3,861	$ (71)	$ 12,197	$ (71)
Acquisition and Other Charges:
Acquisitions and costs related to issuance of debt	31	30	94	88
Sponsor and administration fees paid to Silver Lake		281	132	844
Severance, facility and other charges not part of restructuring and not part of ongoing operations	58	1,025	392	2,413
Total	$ 3,950	$ 1,265	$ 12,815	$ 3,274