Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Accumulated Other Comprehensive Income (Details)

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Fair Value Measurements - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Unrealized Loss in Accumulated Other Comprehensive Loss, before Tax [Roll Forward]        
Unrealized loss at beginning of the period, before tax $ (56) $ (1,470) $ (53) $ (1,269)
Add: gain (loss) from change in fair value of cash flow hedge, before tax 16 294 (30) (75)
Less: loss reclassified into earnings from effective hedge, before tax 13 (142) (19) (299)
Less: ineffective portion of hedge transferred into earnings, before tax (11) (11) (22) (22)
Unrealized loss at end of the period, before tax (42) (1,023) (42) (1,023)
Unrealized Loss in Accumulated Other Comprehensive Loss, Tax [Roll Forward]        
Unrealized loss at beginning of the period, tax (20) (514) (19) (444)
Add: gain (loss) from change in fair value of cash flow hedge, tax 5 102 (11) (27)
Less: loss reclassified into earnings from effective hedge, tax 4 (50) (7) (105)
Less: ineffective portion of hedge transferred into earnings, tax (4) (4) (8) (8)
Unrealized loss at end of the period, tax (15) (358) (15) (358)
Unrealized Loss In Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Unrealized net gain (loss), beginning of period (36) (956) (34) (825)
Add: gain (loss) from change in fair value of cash flow hedge, net of tax 11 192 (19) (48)
Less: loss reclassified into earnings from effective hedge, net of tax 9 (92) (12) (194)
Less: ineffective portion of hedge transferred into earnings, net of tax (7) (7) (14) (14)
Unrealized net gain (loss), end of the period $ (27) $ (665) $ (27) $ (665)