Segment Reporting (Capital Expenditures by Reportable Segment) (Details2) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2016	Apr. 30, 2015
Property, Plant and Equipment [Line Items]
Capital expenditures	$ 19.2	$ 35.6
Aerospace Solutions Group
Property, Plant and Equipment [Line Items]
Capital expenditures	2.8	5.4
Energy Services Group
Property, Plant and Equipment [Line Items]
Capital expenditures	$ 16.4	$ 30.2

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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