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Inventory (Details) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
Inventory [Abstract]    
Raw materials $ 95,757,000 $ 77,135,000
Work in process 3,502,000 2,583,000
Finished goods 146,366,000 88,174,000
Inventory, gross 245,625,000 167,892,000
Less allowance for excess and obsolete inventory (11,899,000) (6,682,000)
Total 233,726,000 161,210,000
Inventory unreturned $ 8,469,000 7,508,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities   0
Used cores expected to be returned by customers   0
Remanufactured cores held in finished goods   0
Remanufactured cores held at customers' locations   0
Long-term core inventory - gross   0
Less allowance for excess and obsolete inventory   0
Total   0
Long-term core inventory deposits   0
As Revised [Member] | ASU 2014-09 [Member]    
Inventory [Abstract]    
Raw materials   25,805,000
Work in process   635,000
Finished goods   53,973,000
Inventory, gross   80,413,000
Less allowance for excess and obsolete inventory   (4,138,000)
Total   76,275,000
Inventory unreturned   7,508,000
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities   53,278,000
Used cores expected to be returned by customers   12,970,000
Remanufactured cores held in finished goods   34,201,000
Remanufactured cores held at customers' locations   200,389,000
Long-term core inventory - gross   300,838,000
Less allowance for excess and obsolete inventory   (2,544,000)
Total   298,294,000
Long-term core inventory deposits   5,569,000
Adoption of ASC 606 [Member] | ASU 2014-09 [Member]    
Inventory [Abstract]    
Raw materials [1]   51,330,000
Work in process [1]   1,948,000
Finished goods [2]   34,201,000
Inventory, gross   87,479,000
Less allowance for excess and obsolete inventory [3]   (2,544,000)
Total   84,935,000
Inventory unreturned   0
Long-term core inventory [Abstract]    
Used cores held at the Company's facilities [1]   (53,278,000)
Used cores expected to be returned by customers [4]   (12,970,000)
Remanufactured cores held in finished goods [2]   (34,201,000)
Remanufactured cores held at customers' locations [5]   (200,389,000)
Long-term core inventory - gross   (300,838,000)
Less allowance for excess and obsolete inventory [3]   2,544,000
Total   (298,294,000)
Long-term core inventory deposits [6]   $ (5,569,000)
[1] Used cores held at the Company's facilities of $53,278,000 have been reclassified to raw materials and work-in-process in the consolidated balance sheet at March 31, 2018.
[2] Remanufactured Cores held in finished goods of $34,201,000 have been reclassified to finished goods in the consolidated balance sheet at March 31, 2018.
[3] The allowance for excess and obsolete inventory related to Used cores held at the Company's facilities of $2,544,000, which was previously included in long-term core inventory, has been reclassified to inventory-net in the consolidated balance sheet at March 31, 2018.
[4] Used cores expected to be returned by customers of $12,970,000 have been reclassified to contract assets in the consolidated balance sheet at March 31, 2018.
[5] Remanufactured cores held at customers' locations of $200,389,000 have been reclassified to current and long-term contract assets in the consolidated balance sheet at March 31, 2018.
[6] Long-term core inventory deposits of $5,569,000 have been reclassified to long-term contract assets in the consolidated balance sheet at March 31, 2018.