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Capital Stock - Additional Information (Detail)	Mar. 31, 2018 Class Vote $ / shares	Mar. 25, 2017 $ / shares	[1]
Class of Stock [Line Items]
Preferred shares par value | $ / shares	$ 0	$ 0
Number of classes of common stock outstanding | Class	2
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock voting rights per share	1
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock voting rights per share	10
[1] Retrospectively revised (see note 18)

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Common stock voting rights vote per share.

+ References

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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