Document And Entity Information - shares	9 Months Ended
	May 28, 2016	Jun. 30, 2016
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 28, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Entity Registrant Name	MSC INDUSTRIAL DIRECT CO INC
Entity Central Index Key	0001003078
Current Fiscal Year End Date	--08-27
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		48,374,634
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		13,085,282