Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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Debt Senior Notes (Details) ¥ in Millions, $ in Millions	12 Months Ended
Debt Senior Notes (Details) ¥ in Millions, $ in Millions	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)	Jan. 31, 2017 JPY (¥)	Jan. 31, 2017 USD ($)
Debt Instrument [Line Items]
Loss on Extinguishment of Debt	$ 0.0	$ 0.0	$ (93.8)
Proceeds from issuance of long-term debt	98.1	$ 0.0	$ 548.0
2009 10.00% Series A, due April 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 50.0
Debt Instrument, Interest Rate, Stated Percentage				10.00%	10.00%
2008 9.05% Series A, due December 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 100.0
Debt Instrument, Interest Rate, Stated Percentage				9.05%	9.05%
2009 10.00% Series A, due February 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 125.0
Debt Instrument, Interest Rate, Stated Percentage				10.00%	10.00%
2009 10.00% Series B, due February 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 125.0
Debt Instrument, Interest Rate, Stated Percentage				10.00%	10.00%
2010 1.72% Notes, due September 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| ¥				¥ 10,000.0
Debt Instrument, Interest Rate, Stated Percentage				1.72%	1.72%
2012 4.40% Series B Notes, due July 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal	$ 50.0
Debt Instrument, Face Amount					$ 250.0
Debt Instrument, Interest Rate, Stated Percentage				4.40%	4.40%
2014 3.80% Senior Notes, due October 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 250.0
Debt Instrument, Interest Rate, Stated Percentage				3.80%	3.80%
Debt Instrument, Interest Rate, Effective Percentage				3.836%	3.836%
2014 4.90% Senior Notes, due October 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 300.0
Debt Instrument, Interest Rate, Stated Percentage				4.90%	4.90%
Debt Instrument, Interest Rate, Effective Percentage				4.926%	4.926%
2016 0.78% Senior Notes, due August 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				¥ 10,000.0	$ 88.0
Debt Instrument, Interest Rate, Stated Percentage				0.78%	0.78%