Stock-based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Sep. 30, 2000	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Former Chairman of the Board [Member]	Mar. 31, 2014 Minimum [Member]	Sep. 30, 2000 Maximum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2014 Fiscal 2014 (2014 - 2016) [Member]	Mar. 31, 2014 Fiscal 2013 (2013 - 2015) [Member]	Mar. 31, 2014 Fiscal 2012 (2012 - 2014) [Member]	Mar. 31, 2014 Fiscal 2011 (2011 - 2013) [Member]	Dec. 31, 2013 Performance Shares [Member]	Dec. 31, 2013 Performance Shares [Member] Maximum [Member]	Mar. 31, 2014 Performance Shares [Member] Fiscal 2014 (2014 - 2016) [Member]	Mar. 31, 2014 Performance Shares [Member] Fiscal 2013 (2013 - 2015) [Member]	Mar. 31, 2014 Performance Shares [Member] Fiscal 2012 (2012 - 2014) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] 2009 Equity Incentive Plan [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] 2009 Equity Incentive Plan [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] 2009 Equity Incentive Plan [Member]	Mar. 31, 2014 Deferred Stock Units (DSUs) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) and Deferred Stock Units (DSUs) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) and Deferred Stock Units (DSUs) [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) and Deferred Stock Units (DSUs) [Member] Maximum [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) and Deferred Stock Units (DSUs) [Member] Maximum [Member]	Mar. 31, 2014 Employee [Member] Nonqualified Stock Options [Member]	Mar. 31, 2014 Employee [Member] Nonqualified Stock Options [Member] Minimum [Member]	Mar. 31, 2014 Employee [Member] Nonqualified Stock Options [Member] Maximum [Member]	Mar. 31, 2014 Board Of Director [Member] Nonqualified Stock Options [Member]	Mar. 31, 2014 Board Of Director [Member] Nonqualified Stock Options [Member] Minimum [Member]	Mar. 31, 2014 Board Of Director [Member] Nonqualified Stock Options [Member] Maximum [Member]
Stock Based Compensation Activity [Line Items]
Unrecognized compensation costs related to non-vested awards		$ 3,900,000		$ 3,900,000
Weighted average period for recognition of compensation costs related to non-vested awards				2 years 1 month 6 days
Performance Share Awards Fully Expensed		1,400,000		1,400,000
Weighted average per share fair value of stock options		$ 7.61	$ 9.99	$ 8.72	$ 8.69
Dividend yield		0.00%	0.00%	0.00%	0.00%
Percent of non-qualified stock options vesting on each of the anniversary dates of the grant																																25.00%			100.00%
Vesting Terms																																Employee non-qualified stock options generally become exercisable with respect to 25% of the shares on each of the first four anniversaries following the grant date			Board member options vest on a prorated basis within the one-year period following the grant date.
Stock option expiration term upon expiration of employment or service																																	7 years	10 years		7 years	10 years
Total pre-tax intrinsic value of options exercised		900,000		1,300,000						100,000		100,000
Stock option related expense		600,000		600,000
Restricted stock expense		200,000		200,000		200,000				100,000		100,000
Performance period start year													2014	2013	2012	2011
Performance period end year													2016	2015	2014	2013
Performance Shares, time period				3 years
Performance share awards, estimated vesting percentage							20.00%				200.00%
Issuance of shares																	122,053	137,066
Expense recognized related to Performance Shares		300,000	400,000	500,000	600,000
Fair value of performance shares for grants awarded																			900,000	900,000	800,000
Common stock authorized, shares								400,000
Annual compensation withheld								10.00%
Annual compensation withheld, maximum limit	25,000
Employee contributions									100,000	100,000	100,000	100,000
Stock compensation expenses recognized									100,000	100,000	100,000	100,000
Number of stock units awarded																									24,834	24,834	9,349
Number of stock units forfeited																								3,417
Number of deferred stock units issued value																											219,000
Stock-based compensation expenses		$ 1,649,000	$ 846,000	$ 2,462,000	$ 1,238,000																	$ 200,000	$ 200,000					$ 300,000	$ 400,000	$ 100,000	$ 100,000
Vesting period Description																							The RSU awards were modified in the second quarter of fiscal 2014 to vest pro-rata over a 12-month service period.