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Stock-Based Compensation Restricted Stock (Tables)
 12 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted stock and restricted stock unit transactions
 
 
Number of Shares
 
Weighted-Average Grant Date Value
Unvested shares at March 31, 2014
 
3,334

 
$
30.77

Granted
 
1,236

 
48.03

Vested
 
(1,330
)
 
30.92

Canceled/forfeited
 
(190
)
 
35.95

Unvested shares at March 31, 2015
 
3,050

 
37.38

Granted
 
1,332

 
48.95

Vested
 
(1,261
)
 
34.91

Canceled/forfeited
 
(63
)
 
42.09

Unvested shares at March 31, 2016
 
3,058

 
43.34

Granted
 
1,658

 
31.26

Vested
 
(1,267
)
 
39.15

Canceled/forfeited
 
(128
)
 
42.39

Unvested shares at March 31, 2017
 
3,321

 
$
38.92