Pension and Savings Plans - Weighted Average Asset Allocation for Pension Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 238,755	$ 243,407	$ 208,120
Asset allocation actual	100.00%	100.00%
Asset allocation target	100.00%	100.00%
U.S. Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 60,286	$ 70,021
Asset allocation actual	25.30%	28.80%
Asset allocation target	25.80%	25.80%
International Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 38,725	$ 45,521
Asset allocation actual	16.20%	18.70%
Asset allocation target	17.20%	17.20%
Emerging Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 16,393	$ 24,187
Asset allocation actual	6.90%	9.90%
Asset allocation target	8.50%	8.50%
High Yield Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 19,310	$ 22,647
Asset allocation actual	8.10%	9.30%
Asset allocation target	8.50%	8.50%
Alternative Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 307	$ 803
Asset allocation actual	0.10%	0.30%
Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 93,362	$ 67,652
Asset allocation actual	39.10%	27.80%
Asset allocation target	40.00%	40.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 10,372	$ 12,576
Asset allocation actual	4.30%	5.20%
Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 238,448	$ 242,604
Level 2 [Member] | U.S. Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	60,286	70,021
Level 2 [Member] | International Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	38,725	45,521
Level 2 [Member] | Emerging Equities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	16,393	24,187
Level 2 [Member] | High Yield Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	19,310	22,647
Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	93,362	67,652
Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	10,372	12,576
Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	307	803
Level 3 [Member] | Alternative Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Asset allocation fair value	$ 307	$ 803