Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Environmental and legal matters Environmental and legal matters (Details)	Mar. 03, 2017	Mar. 20, 2014
Loss Contingencies
Number of facilities served search and seizure warrants	3
Companies
Loss Contingencies
Number of Defendants		18
Individuals
Loss Contingencies
Number of Defendants		100
Subsidiaries
Loss Contingencies
Number of Defendants		2
Current employees
Loss Contingencies
Number of Defendants		2
Former employees
Loss Contingencies
Number of Defendants		1