Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2018	Nov. 06, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	S
Entity Registrant Name	SPRINT CORP
Entity Central Index Key	0000101830
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		4,077,576,840