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Net Loss Per Share - Summary of Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Denominator:
Weighted-average common shares outstanding (in shares)	213,055	203,818
Basic and diluted net loss per share (in dollars per share)	$ (0.35)	$ (0.31)
Class A
Numerator:
Allocation of distributed net loss	$ (50,145)	$ (40,599)
Denominator:
Weighted-average common shares outstanding (in shares)	143,579	129,206
Basic and diluted net loss per share (in dollars per share)	$ (0.35)	$ (0.31)
Class B
Numerator:
Allocation of distributed net loss	$ (24,265)	$ (23,445)
Denominator:
Weighted-average common shares outstanding (in shares)	69,476	74,612
Basic and diluted net loss per share (in dollars per share)	$ (0.35)	$ (0.31)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 260
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB
-Name Accounting Standards Codification
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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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