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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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