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Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 02, 2017	Sep. 12, 2017
Discontinued Operations And Disposal Groups [Abstract]
Income tax provision (benefit)	$ 1.5
Professional fee	$ 0.5
Income tax refund		$ 2.0

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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