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Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - Accounting Standards Update 2016-09 [Member] $ in Millions	3 Months Ended
	Apr. 30, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact to deferred tax assets and valuation allowance upon adoption	$ 8.4
Cumulative effect adjustment to retained earnings	$ 2.0

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References + Details