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

The number of shares under options and SARs that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsForfeituresInPeriod
Namespace Prefix:	ssi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsForfeituresInPeriodWeightedAverageExercisePrice
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 options and SARs that are exercisable.

No definition available.

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

As of the balance sheet date, the number of stock options and SARs outstanding.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsOutstandingNumber
Namespace Prefix:	ssi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

As of the balance sheet date, the number of stock options and SARs outstanding, vested and exercisable.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsandSARsOutstandingVestedandExercisableNumber
Namespace Prefix:	ssi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The weighted average period between the balance sheet date and expiration for all vested portions of options and 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_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsOutstandingWeightedAverageRemainingContractualTerm
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
Period Type:	duration

Number of share options (or share units) and SARs exercised during the current period.

No definition available.

Name:	ssi_StockIssuedDuringPeriodSharesStockOptionsAndSarsExercised
Namespace Prefix:	ssi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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 options and SARs outstanding and currently exercisable under the stock option plan.

No definition available.