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Acquisitions and Divestitures - Narrative - Fiscal 2015 Divestitures (Details) - Trace Laboratories - USD ($) $ in Millions		3 Months Ended
	Feb. 03, 2015	Apr. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business	$ 11.7
Amount held in escrow	0.5
Net assets of business, book value	4.0
Pre-tax gain on sale of net assets	$ 7.7	$ 7.7

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