Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The weighted average price at which grantees could have acquired the underlying shares with respect to SARs that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsForfeituresInPeriodWeightedAverageExercisePrice
Namespace Prefix:	ssi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest SARs that are exercisable.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsOutstandingAggregateIntrinsicValue
Namespace Prefix:	ssi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The weighted average period between the balance sheet date and expiration for all vested portions of SARs outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementBySharebasedPaymentAwardSARsOutstandingWeightedAverageRemainingContractualTerm
Namespace Prefix:	ssi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	ssi_ShareBasedCompensationStockOptionsAndSarsOutstandingRollForward
Namespace Prefix:	ssi_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- References

No definition available.

Name:	ssi_StockOptionsAndSarsAggregateIntrinsicValueAbstract
Namespace Prefix:	ssi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	ssi_StockOptionsAndSarsWeightedAverageExercisePriceAbstract
Namespace Prefix:	ssi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	ssi_StockOptionsAndSarsWeightedAverageRemainingContractualTermYearsAbstract
Namespace Prefix:	ssi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of SARs outstanding and currently exercisable under the stock option plan.

No definition available.

Name:	ssi_WeightedAverageExercisePriceSARS
Namespace Prefix:	ssi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901