Information Concerning Supplemental Disclosures of Cash Flow Activities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jul. 31, 2013	Jul. 31, 2012
Cash paid, net for:
Interest	$ 6,136	$ 5,878
Income taxes	$ 4,932	$ 5,594

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Name:	us-gaap_IncomeTaxesPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration