Inventory (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013 Fenco [Member]	May 31, 2013 Fenco [Member]
Non-core inventory [Abstract]
Raw materials	$ 14,800,000	$ 14,152,000
Work in process	159,000	137,000
Finished goods	18,551,000	19,239,000
Non-core inventory, gross	33,510,000	33,528,000
Less allowance for excess and obsolete inventory	(1,797,000)	(1,690,000)
Total	31,713,000	31,838,000
Inventory unreturned	7,532,000	6,981,000
Long-term core inventory [Abstract]
Used cores held at the Company's facilities	25,344,000	22,227,000
Used cores expected to be returned by customers	4,734,000	5,147,000
Remanufactured cores held in finished goods	14,599,000	15,019,000
Remanufactured cores held at customers' locations	78,876,000	76,626,000
Long-term core inventory - gross	123,553,000	119,019,000
Less allowance for excess and obsolete inventory	(928,000)	(808,000)
Total	122,625,000	118,211,000
Long-term core inventory deposits	27,805,000	27,610,000
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-core inventory, deconsolidated			25,731,000	25,731,000
Disposal Group, Including Discontinued Operation, Inventory Unreturned			5,321,000	5,321,000
Disposal Group, Including Discontinued Operation, Long-term Core Inventory, Net			$ 40,471,000	$ 40,471,000

For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of the added unit value of finished goods shipped to customers that the entity expects to be returned within the normal operating cycle of one year.

No definition available.