Document And Entity Information - shares	9 Months Ended
	May. 30, 2015	Jun. 30, 2015
Document Type	10-Q
Amendment Flag	false
Document Period End Date	May 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Registrant Name	MSC INDUSTRIAL DIRECT CO INC
Entity Central Index Key	0001003078
Current Fiscal Year End Date	--08-29
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		48,414,167
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		13,295,747