Summary of Significant Accounting Policies - Long Term Contingent Consideration (Details) (Nuclear Logistics Incorporated [Member], USD $) In Millions, unless otherwise specified	Feb. 28, 2014	Jun. 02, 2012
Nuclear Logistics Incorporated [Member]
Business Acquisition, Contingent Consideration [Line Items]
Future contingent consideration	$ 9.1	$ 20.0

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant