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Deferred Costs	3 Months Ended
	Apr. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, were $200 million and $204 million as of April 30, 2018 and January 31, 2018, respectively. Amortization expense for the deferred costs was $16 million and $14 million for the three months ended April 30, 2018 and 2017, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

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- Definition

Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings including current and noncurrent term.

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