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Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Potentially dilutive securities	156,200	169,000	169,000
Weighted-average exercise price	$ 61.83	$ 62.66	$ 62.66

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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