Share Based Awards (Details 1)	3 Months Ended			12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Two Thousand Five Stock Options Plan [Member] May 31, 2011[Member]	Jun. 30, 2011 Two Thousand Five Stock Options Plan [Member] Fiscal year 2012 option grants [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member] November 29, 2010 [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member] August 3, 2010 [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member] June 4, 2010 [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member] June 2, 2010 [Member]	Mar. 31, 2011 Two Thousand Five Stock Options Plan [Member] Fiscal year 2011 option grants [Member]
Summary of stock options granted
Option Grant Date		May 31, 2011		Nov. 29, 2010	Aug. 03, 2010	Jun. 04, 2010	Jun. 02, 2010
Number of Share Granted	229,700	229,700	229,700	10,000	5,000	25,000	15,000	55,000
Weighted Average Exercise Price Granted		86.08		64.32	55.24	56.29	58.62
Exercise of option grants	Three months from the grant date	Five Years		Five Years	Five Years	Five Years	Five Years
Option Grants Expires		43616		43433	43315	43255	43253