Condensed Consolidated Statements of Cash Flows (Parenthetical) - Accounting Standards Update 2016-09 [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 31, 2017	Jul. 31, 2017
Increase in net cash provided by operating activities due to adoption of accounting standards	$ 14.8	$ 28.7
Decrease in net cash provided by financing activities due to adoption of accounting standards	$ 14.8	$ 28.7

New accounting pronouncement or change in accounting principle effect of adoption quantification in net cash provided by used in financing activities.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration