Computation of Basic and Diluted Net Income (loss) Per Common Share (Parenthetical) (Detail) - Convertible Notes shares in Millions	3 Months Ended	6 Months Ended
Jul. 02, 2017 $ / shares shares	Jul. 02, 2017 $ / shares shares
Net Income Loss Per Common Share
Initial debt conversion price \| $ / shares	$ 31.84	$ 31.84
Shares that would be issued upon conversion \| shares	14.4	14.4

The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant