Stock Option Plan - Performance Stock Units Activity (Details) - Performance Stock Units $ / shares in Units, $ in Millions	9 Months Ended
May 30, 2020 USD ($) $ / shares shares
Units
Non-vested at beginning of period (in shares) \| shares	192,389
Granted (in shares) \| shares	121,288
Vested (in shares) \| shares	0
Forfeited (in shares) \| shares	(3,142)
Non-vested at end of period (in shares) \| shares	310,535
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 11.93
Granted (in dollars per share) \| $ / shares	27.39
Vested (in dollars per share) \| $ / shares	0
Forfeited (in dollars per share) \| $ / shares	16.67
Non-vested at end of period (in dollars per share) \| $ / shares	$ 17.92
Additional disclosures
Period for recognition of unrecognized compensation cost	1 year 9 months 29 days
Unrecognized compensation costs \| $	$ 3.8

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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