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Operating Efficiency Initiatives and Other Items (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Apr. 30, 2015	Jul. 31, 2017
Restructuring And Related Activities [Abstract]
Pre-tax charges	$ 1.3	$ 2.7
Operating efficiency initiatives and other items, completion date			Jan. 31, 2016

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Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 5.P.4(a))
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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