Annual report pursuant to Section 13 and 15(d)

SCHEDULE II CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (Details)

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SCHEDULE II CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Allowance for bad debt        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at beginning of period $ 16 $ 22 $ 27 $ 88
Net additions (releases) charged to expense (24) (78) 40  
Recoveries (Deductions) 18 73 (101)  
Balance at end of period 16 22 27  
Reserves for manufacturing inventories        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at beginning of period 4,883 4,956 3,764 4,297
Net additions (releases) charged to expense 2,579 1,920 797  
Recoveries (Deductions) (2,652) (728) (1,330)  
Balance at end of period 4,883 4,956 3,764  
Reserves for service parts inventories        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at beginning of period 13,327 16,653 20,909 31,460
Net additions (releases) charged to expense 4,960 5,973 3,698  
Recoveries (Deductions) (8,286) (10,229) (14,249)  
Balance at end of period 13,327 16,653 20,909  
Deferred tax valuation allowance        
Movement in Valuation Allowances and Reserves [Roll Forward]        
Balance at beginning of period 202,991 224,661 252,475 $ 261,337
Net additions (releases) charged to expense 4,002 36,237 7,947  
Recoveries (Deductions) (25,672) (64,051) (16,809)  
Balance at end of period $ 202,991 $ 224,661 $ 252,475