Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to adopt ASU 2016-09					$ 0
Additional Paid in Capital
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to adopt ASU 2016-09					122
Accumulated Deficit
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to adopt ASU 2016-09					(122)
Accounting Standards Update 2016-09 | Additional Paid in Capital
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to adopt ASU 2016-09					100
Accounting Standards Update 2016-09 | Accumulated Deficit
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment to adopt ASU 2016-09					$ (100)
Restricted Share Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted weighted-average common shares outstanding (in shares)	1.3	1.1	1.3	1.1
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted weighted-average common shares outstanding (in shares)	3.3	1.3	3.1	1.3