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Stockholders' Deficit - Number of PSUs Granted and Grant Date Fair Value of PSUs (Details) - $ / shares		1 Months Ended
	Feb. 14, 2019	Jul. 31, 2019
TSR
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares)	49,819	20,724
Fair value on grant date (in usd per share)	$ 58.25	$ 55.82
ROIC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares)	66,807	25,997
Fair value on grant date (in usd per share)	$ 42.16	$ 43.22
Adjusted EBITDA
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units granted (in shares)	66,807	25,997
Fair value on grant date (in usd per share)	$ 42.16	$ 43.22

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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