Inventory (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013	May 31, 2013 Fenco [Member]
Non-core inventory [Abstract]
Raw materials	$ 18,787,000	$ 14,152,000
Work-in-process	124,000	137,000
Finished goods	30,197,000	19,239,000
Non-core inventory, gross	49,108,000	33,528,000
Less allowance for excess and obsolete inventory	(1,862,000)	(1,690,000)
Total	47,246,000	31,838,000
Inventory unreturned	7,534,000	6,981,000
Long-term core inventory [Abstract]
Used cores held at the Company's facilities	23,718,000	22,227,000
Used cores expected to be returned by customers	6,160,000	5,147,000
Remanufactured cores held in finished goods	18,093,000	15,019,000
Remanufactured cores held at customers' locations	96,351,000	76,626,000
Long-term core inventory - gross	144,322,000	119,019,000
Less allowance for excess and obsolete inventory	(846,000)	(808,000)
Total	143,476,000	118,211,000
Long-term core inventory deposit	29,375,000	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
Inventory unreturned, deconsolidated			5,321,000
Long-term core inventory, deconsolidated			$ 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.