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Property, Plant and Equipment (Tables)
12 Months Ended
Aug. 31, 2020
Property, Plant and Equipment [Abstract]  
Components of Property, Plant and Equipment Estimated useful lives for major classes of depreciable assets are as follows:
Asset Class
Estimated Useful Life
Buildings
Up to 35 years
Leasehold improvements
Shorter of lease term or useful life of the improvement
Machinery and equipment
2 to 10 years
Furniture, fixtures and office equipment
5 years
Computer hardware and software
3 to 7 years
Transportation equipment
3 years

Property, plant and equipment consists of the following (in thousands):
 
August 31, 2020
 
August 31, 2019
Land and improvements
$
141,715

 
$
146,719

Buildings
1,152,204

 
962,559

Leasehold improvements
1,144,238

 
1,092,787

Machinery and equipment
4,685,611

 
4,262,015

Furniture, fixtures and office equipment
221,709

 
209,257

Computer hardware and software
760,195

 
671,252

Transportation equipment
9,061

 
16,423

Construction in progress
76,337

 
83,234

 
8,191,070

 
7,444,246

Less accumulated depreciation and amortization
4,525,758

 
4,110,496

 
$
3,665,312

 
$
3,333,750


Schedule of Depreciation and Maintenance and Repair Expenses
Depreciation and maintenance and repair expenses were as follows for the periods indicated (in thousands):
 
Fiscal Year Ended August 31,
 
2020
 
2019
 
2018
Depreciation expense
$
739,038

 
$
739,910

 
$
735,213

Maintenance and repair expense
$
333,772

 
$
288,309

 
$
266,691