Employee withhold percentage of gross earnings.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- 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.

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

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-Publisher FASB
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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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- Definition

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			6 Months Ended
	Mar. 15, 2018	Mar. 15, 2017	Jun. 30, 2018	Jan. 30, 2018	Sep. 18, 2017	Mar. 16, 2017	Mar. 16, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Purchase price of common stock by employees (as a percent)			85.00%
Closing price of shares issued (in dollars per share)				$ 22.00
Employee Stock Purchase Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee withholding percentage			15.00%
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			$ 62.4
Unrecognized compensation expense, recognition period			3 years 11 days
Options to Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, recognition period			2 years 2 months 23 days
Unrecognized compensation cost, stock options			$ 9.1
Stock options vested, fair value			$ 0.5
Stock options granted, weighted-average grant date fair value (in dollars per share)			$ 11.86
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to employees (in shares)	123,607	138,085
Aggregate proceeds from issuance of common stock to employees	$ 1.6	$ 1.5
Share issued, price per share (in dollars per share)		$ 12.79			$ 14.78	$ 12.96	$ 10.60
Closing price of shares issued (in dollars per share)		$ 15.05			$ 17.39	$ 15.25	$ 12.47