Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2016	Feb. 03, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
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		3,987,167,109