Document and Entity Information - shares	6 Months Ended
	Jan. 01, 2017	Feb. 03, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	Sparton Corp.
Entity Central Index Key	0000092679
Current Fiscal Year End Date	--07-02
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jan. 01, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		9,835,635