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Installment Receivables Installment Receivables - Narrative (Details)	3 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Payment term (up to)	24 months

X

- Definition

Installment Billing Maximum Payment Term

+ References

No definition available.

+ Details

Name:	s_InstallmentBillingMaximumPaymentTerm
Namespace Prefix:	s_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration