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Subsequent Event - Fire at Australian Manufacturing Facility (Details Textual) (Picton manufacturing facility [Member])	6 Months Ended
	Jul. 01, 2012
Picton manufacturing facility [Member]
Subsequent Event - Fire at Australian Manufacturing Facility (Textual) [Abstract]
Percentage of annual production represented by facility	7.00%
Percentage of Net sales under facility	10.00%
Percentage of operating income represented by facility	13.00%

X

- Definition

Percentage of annual production represented by facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifsia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of operating income represented by facility.

+ References

No definition available.

+ Details

Name:	ifsia_PercentageOfOperatingIncomeRepresentedByFacility
Namespace Prefix:	ifsia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifsia_SubsequentEventFireAtManufacturingFacilityTextualAbstract
Namespace Prefix:	ifsia_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of net product revenue to total net revenue from the sale of goods as of year end.

+ References

No definition available.

+ Details

Name:	us-gaap_SalesRevenueGoodsNetPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant