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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
12 Months Ended
Aug. 25, 2018
USD ($)
Loss Contingencies [Line Items]  
Commitment for construction $ 41.3
Surety bonds $ 23.6
The period of time before expiration of standby letters of credit and surety bonds Less than one year
Standby Letters of Credit [Member]  
Loss Contingencies [Line Items]  
Borrowings, outstanding $ 106.8