Commitments and contingencies - Legal proceedings (Detail)	1 Months Ended	4 Months Ended
	Jan. 01, 2016 lawsuit	May 27, 2016 lawsuit	Jul. 29, 2016 item
Commission cause finding related to the criminal background check policy | Pending litigation
Legal proceedings
Number Of Defenses | item			2
Alleged violation of state consumer protection laws
Legal proceedings
Number of suits filed	7
Alleged violation of state consumer protection laws federal district courts
Legal proceedings
Number of suits filed	6	14