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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015	Mar. 30, 2013
Statement Of Stockholders Equity [Abstract]
Dividends per share	$ 0.27us-gaap_CommonStockDividendsPerShareDeclared	$ 0.48us-gaap_CommonStockDividendsPerShareDeclared	$ 0.32us-gaap_CommonStockDividendsPerShareDeclared
Repurchase of equity component of convertible debt, taxes			$ 587sptn_RepurchaseOfEquityComponentsOfConvertibleDebtNetOfTax

X

- Definition

Repurchase of equity components of convertible debt net of tax.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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