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

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.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisableWeightedAverageExercisePrice
Namespace Prefix:	ssi_
Data Type:	num:perShareItemType
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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisableWeightedAverageRemainingContractualTerm
Namespace Prefix:	ssi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

The weighted average price at which option and SAR holders acquired shares when converting their stock options and SARs into shares under the plan during the reporting period.

No definition available.

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

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options and SARs outstanding under the plan as of the balance sheet date.

No definition available.

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

The number of shares reserved for issuance under stock option agreements and SARs awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

No definition available.

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

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option and SARs plan.

No definition available.

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

The weighted average period between the balance sheet date and expiration for all awards outstanding 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:decimalItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

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

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options and SARs outstanding can be converted under the option plan.

No definition available.

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

As of the balance sheet date, the weighted-average exercise price for outstanding stock options and SARs that are fully vested or expected to vest.

No definition available.

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

The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options and SARs outstanding, which may be expressed in a decimal value for number of years.

No definition available.

Name:	ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm
Namespace Prefix:	ssi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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

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

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