Restructuring Charges - Summary of Expected Restructuring Costs from Inception (Details) $ in Thousands	Oct. 28, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	$ 141,000
Employee severance and termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	80,000
Asset impairment charges
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	19,000
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	27,000
Other costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	15,000
Underground
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	111,000
Underground | Employee severance and termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	59,000
Underground | Asset impairment charges
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	19,000
Underground | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	20,000
Underground | Other costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	13,000
Surface
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	27,000
Surface | Employee severance and termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	18,000
Surface | Asset impairment charges
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	0
Surface | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	7,000
Surface | Other costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	2,000
Corporate
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	3,000
Corporate | Employee severance and termination costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	3,000
Corporate | Asset impairment charges
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	0
Corporate | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	0
Corporate | Other costs
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	$ 0