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Commitments and Contingencies (Detail) - USD ($)		3 Months Ended
	Oct. 07, 2016	Apr. 01, 2017	Dec. 31, 2016	Jul. 27, 2018	Jun. 30, 2018	Sep. 04, 2012
Loss Contingencies [Line Items]
Assessed damages						$ 4,000,000
Plaintiff statutory damages on individual basis	$ 25
Payment of settlement compensation		$ 8,500,000
Litigation settlement expense			$ 9,200,000
Minimum
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued					$ 0
Maximum
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued					$ 100,000,000
Subsequent Event
Loss Contingencies [Line Items]
Assessed damages				$ 4,800,000

X

- Definition

Amount assessed in damages.

+ References

No definition available.

+ Details

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X

- Definition

Litigation Settlement, Amount Awarded to Other Party On Individual Basis

+ References

No definition available.

+ Details

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X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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X

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344

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