Fair Value Measurements (Details 3) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
SERP obligations [Member]
Changes in the fair value of the Level 3 assets and liabilities related to continuing operations
Balance at April 1, 2011	$ 3,323	$ 5,791	$ 0	$ 5,852
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Amortization	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Purchases	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Provisions, Payments, Other Charges	(3,323)	61
Other employee benefits plans obligations [Member]
Changes in the fair value of the Level 3 assets and liabilities related to continuing operations
Balance at April 1, 2011	196	305	196	305
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Amortization	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Purchases	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Provisions, Payments, Other Charges	0	0
Restructuring liabilities [Member]
Changes in the fair value of the Level 3 assets and liabilities related to continuing operations
Balance at April 1, 2011	6,299	733	1,574	4,451
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Amortization	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Purchases	1,213	4,716
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Provisions, Payments, Other Charges	(5,938)	(998)
Goodwill [Member]
Changes in the fair value of the Level 3 assets and liabilities related to continuing operations
Balance at April 1, 2012	15,198	15,211	15,223	15,104
Unrealized gains (losses) relating to instruments still held at the reporting date	25	(107)
Amortization	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Purchases	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Provisions, Payments, Other Charges	0	0
Intangible Assets [Member]
Changes in the fair value of the Level 3 assets and liabilities related to continuing operations
Balance at April 1, 2012	14,135	22,535	14,951	21,962
Unrealized gains (losses) relating to instruments still held at the reporting date	0	0
Amortization	(1,077)	(1,532)
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Purchases	0	0
Fair Value Measurements with Unobservable Inputs Reconciliation Nonrecurring Basis, Provisions, Payments, Other Charges	$ 1,893	$ 959