Inventories - Additional Information (Detail) (USD $)	Sep. 30, 2013
Inventory [Line Items]
Deferred credit for LIFO inventory replacement	$ 32,213

Deferred Credit Reflecting Difference Between Replacement Cost And Lifo Cost

No definition available.

Name:	frd_DeferredCreditReflectingDifferenceBetweenReplacementCostAndLifoCost
Namespace Prefix:	frd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant