Amount classified as trade receivables attributable to disposal group held for sale or disposed of.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Name:	us-gaap_TradeReceivablesHeldForSaleNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Sale of Non-United States Accounts Receivable - Additional Information (Detail)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 European RPA [Member] USD ($)	Jan. 31, 2015 European RPA [Member] EUR (€)	Jan. 31, 2015 Singapore RPA [Member] USD ($)	Jan. 31, 2015 Singapore RPA [Member] SGD
Finance Receivable Transferred To Held For Sale [Line Items]
Financing receivable maximum amount under receivable purchase agreement		$ 165,000,000	€ 145,000,000	$ 11,200,000	15,000,000
Receivables held by third party	$ 0us-gaap_TradeReceivablesHeldForSaleNet