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Income Taxes (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	May 31, 2018	May 31, 2017
Income Taxes
Corporate income tax rate (as a percent)	21.00%	35.00%
Income tax expense (benefit) as a percent of income before income taxes			6.20%	1.10%
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation			$ 0.3	$ 2.5
Tax benefit from the lapse of the statute of limitations related to an uncertain tax position			$ 0.8	$ 0.6

X

- Definition

Income tax expense (benefit) as a percent of income before income taxes.

+ References

No definition available.

+ Details

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X

- Definition

Amount of decrease in unrecognized tax benefits resulting from recognition of excess tax benefits from share-based compensation in income tax expense.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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- References

No definition available.

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X

- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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