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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | [1] | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 1.6 | $ (4.7) | $ (43.8)
Deferred |  |  |  |  |  |  |  |  | 8.4 | 220.9 | (11.9)
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (1.9) | 0.5 | (13.2)
Deferred |  |  |  |  |  |  |  |  | 1.3 | 20.9 | 9.0
Foreign: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 93.9 | 68.4 | 69.5
Deferred |  |  |  |  |  |  |  |  | (45.0) | 4.2 | (8.4)
Income tax expense | $ 5.2 | $ 13.5 | $ 25.2 | $ 14.4 | $ 16.7 | $ 21.3 | $ 269.5 | $ 2.7 | $ 58.3 | $ 310.2 | $ 1.2
[1] | Certain first quarter fiscal 2017 balances have been revised to reflect the adoption of ASU 2016-09. As the adoption occurred in the second quarter of fiscal 2017, we are required to reflect any adjustments as of February 1, 2016, the beginning of the annual period that includes the interim period of adoption, and are required to revise our reported quarterly results for the first quarter. The revision resulted in a $5.3 million decrease of stock-based compensation expense from the previously reported expense. See Note 1, "Business and Summary of Significant Accounting Policies" for further discussion on the adoption.

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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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